Malditah Musings

Earth, a planet

I INTRODUCTION

Earth (planet), one of nine planets in the solar system, the only planet known to harbor life, and the "house" people. Earth from space resembles a big blue marble with Swirling white clouds floating above the blue oceans. About 71 percent of Earth's surface is covered by water, which is essential to life. The rest is land, mostly in the form of continent dominate the oceans.

An earth oxygen-rich and protective atmosphere, moderate temperatures, abundant water, and various chemical composition of an enable Earth to support life, the only planet known to harbor life. The planet is made of stone and metal, which is present in molten form to the surface under it. The Apollo 17 spacecraft took this kuha sa 1972 the Arabian Peninsula, the African continent, and Antarctica (most of the white area near the bottom).

Earth's surface is surrounded by a layer of gas known as environment, which extends upward from the surface, slowly thinning into space. Surface below is a hot within the rocky material and two core layers consist of nickel metal and iron in solid and liquid form.

Unlike other planets, Earth has a unique set of characteristics in mind due supporting life we know it. It is not too hot, like Mercury, the closest planet to Sun, nor too cold, like Mars and the far more distant outer planets-Jupiter, Saturn, Uranus, Neptune, Pluto and small. Earth's atmosphere with just the right amount of gas that traps heat from the Sun, resulting in average climate suitable for the existing water in liquid form. The environment also helps to block radiation from the Sun would be dangerous to life. Earth's atmosphere distinguishes from the planet Venus, which is otherwise much like Earth. Venus is about the same size and mass as Earth, and also not too close or too far from the Sun. But because Venus is too much heat-trapping carbon dioxide in its atmosphere, its skin is hot 462 °-C (864 ° F), hot enough to melt lead and too hot for life to exist.

Although Earth is the only planet known to have life, scientists do not rule the possibility that life is a times exist in other planets or their moons, or may exist today in primitive form. Mars, for example, has many features that resemble river channels, which suggests that liquid water once flowed over it. If so, life has changed there also, and evidence for it might one day be found in fossil form. Water still exist on Mars, but it is frozen into polar ice caps, in permafrost, and perhaps the stone under the skin.

For thousands of years, people just may wonder about the Earth and other planets notably solar system. Many early ideas-for example, that the Earth is a sphere and that traveled around Sun-are based on the reasoning machines. However, it is only with the development of scientific methods of scientific instruments and, especially in the 18th and 19th century, that people began to gather data that may be used to validate theories about Earth and the rest of the day system. By studying fossils found the rock layers, for example, scientists realized that the Earth is much older than previously believed. And by using telescopes, new planets like Uranus, Neptune and Pluto were discovered.

Earth from the Moon Finally 1960s, people saw for the first time what the Earth looked from space. The famous picture of Earth taken by astronauts on the mission of Apollo 8 as they orbited the month at 1968.

The second half of the 20th century, more advances in the study of Earth and the solar system occurred due to the development of rockets that can send spacecraft beyond Earth. People are able to study and observe the Earth from space with satellite I there are scientific instruments. Astronauts land on Moon and ancient rock that gets revealed much about the early solar system. Nowadays the average advancement people's history, people also sent unmanned spacecraft to other planets and their moons. Spacecraft have now visited all the planets except Pluto. The study other planets and moons will provide new knowledge about Earth, as the study of Sun and other stars like it helped shape new theories about how Earth and the rest of the solar system formed.

As a result of recent space exploration, we now know that the Earth is one of the most geologically active of all the planets and moons in the solar system. Earth is constantly changing. Over a long period of time land is built up and worn away, oceans are formed and re-formed, and continents move around, break-up, and united.

Life itself helps change on Earth, especially the manner of living things can alter the Earth's environment. For example, the Earth at one time was the same amount of carbon dioxide in its atmosphere as Venus is now, but the first appearance of life helped remove carbon dioxide over millions of years. The life forms also added oxygen in Earth's atmosphere and made it possible for animal life evolved on earth.

Different scientific fields have broadened our knowledge about Earth, including biogeography, climatology, geology, geophysics, hydrology, meteorology, oceanography, and zoogeography. Collectively, these fields are called Earth science. By studying Earth's atmosphere, above it, and within it and By study of the Sun and the rest of the solar system, scientists have learned much about how Earth came to life, how it changed, and why It continues to change.

II earth, the solar system, galaxy AND

Earth is the third planet from the Sun, after Mercury and Venus. The average distance between Earth and the Sun is 150 million km (93 million mi). Earth and all other solar system planets rotate or orbit, around the Sun because the force of gravity. The earth travels at a speed of approximately 107,000 km / h (about 67,000 mph) sa as it orbits Sun. All but one of the planets orbit the Sun in the same plane that is, if an imaginary line extended from the center of the Sun in the outer regions of the solar system, the orbital paths of planets will intersect line. Exception is Pluto, which is a bizarre (rare) orbit.

Orbital path of the Earth is not quite a perfect circle but rather slightly elliptical (slender). For example, the maximum distance the Earth is about 152 million km (about 95 million mi) from the Sun; minimum distance Earth is about 147 million km (about sa 91 million mi) from the Sun. If Earth orbited the Sun in a perfect circle, it is always the same distance from the Sun.

The solar system, in turn, is part of Milky Way Galaxy, a collection of billions of stars bound together by gravity. The Galaxy is armlike discs of stars that spiral out from the center. The solar system is located in one of the spiral arms, known as the Orion arm, which is about two-thirds of the way from the center of the Galaxy. In most parts of North Hemisphere, this disc of stars can be seen on a summer night as a dense band of light known as Galaxy.

Our own Milky Way Galaxy Solar system exists within one of the spiral arms of disk-shaped galaxy called the Milky Way. Is false-color image looks toward the center of the Galaxy, located 30,000 light-years without. Bright star clusters are visible with darker areas of dust and gas.Photo Researchers, Inc. / Morton-melon / Science Source

Earth is the fifth largest planet in solar system. Its diameter, measured around the equator, is 12,756 km (7926 mi). Earth is not a perfect situation but slightly flattened the poles. Its polar diameter, measured from the North Pole to the South Pole, is somewhat less than the equatorial diameter of flattening for it. Although Earth is the largest four planets-Mercury, Venus, Earth, and Mars-that forms the inner solar system (the planets closest to the Sun), it is small compared to the giant planets of the outer solar system-Jupiter, Saturn, Uranus, and Neptune. For example, the largest planet, Jupiter has a diameter of its equator 143,000 km (89,000 mi), 11 times larger than that of the Earth. A popular feature atmospheric Jupiter, the Great Red Spot, is so large that three Earths would fit inside it.

Earth is a natural satellite, the Moon. The Moon orbits the Earth, completing one revolution in an elliptical path in 27 days 7 hours 43 min 11.5 sec. The Moon orbits the Earth because the force of Earth's gravity. However, the Moon also exerts a gravitational force on Earth. Evidence for the gravitational influence of the Moon's tides are found in the ocean. A popular theory suggests that the Moon split off from the Earth more than 4 billion years ago when a large meteorite or satellite surprise the Earth.

As Earth revolves around the Sun, it rotates, or spins, its axis, speculation of a line running between North and South poles. The period of a complete rotation is defined as a day and takes 23 hours 56 min 4.1 sec. The time of one revolution around the Sun is defined as a year, or 365.2422 solar day, or 365 days 5 hours 48 min 46 sec. Earth also moving along the Milky Way Galaxy as Galaxy rotates and moves through space. It takes more than 200 million years for stars in Galaxy to complete a revolution around the Galaxy's center.

Earth's axis of rotation is inclined (tilted) 23.5 ° relative to its plane of revolution around the Sun. The inclination of the axis creates time and causes height of Sun in the sky at noon to increase and reduce the number of times of changes. The Northern Hemisphere receives the most energy from the Sun when it is tilted towards the Sun. Orientation will match the summer in Northern Hemisphere winter and the Southern-hating globe. The Southern Hemisphere receives maximum energy when it is tilted towards the Sun, due to summer in Southern Hemisphere and winter in Northern-hating globe. Fall and spring occur between orientations.

III earth's atmosphere

The atmosphere is a layer of different gases from reaching surfaces of the world exosphere, the outer limit of the environment, about 9600 km (6000 mi) above the surface. Near the Earth's surface, atmosphere consists of mostly of nitrogen (78 percent) and oxygen (21 percent). The remaining 1 percent of atmospheric gases is made up of argon (0.9 percent); carbon dioxide (0.03 percent); different different amounts of water vapor, and trace amounts of hydrogen, nitrous oxide, ozone, methane, carbon monoxide, helium, neon, krypton and xenon.

A layers of the environment

Branch environment without our environment, there is no life on Earth. A relatively thin envelope, the atmosphere consists of layers of gases that support life and provide protection from harmful radiation. © Microsoft Corporation. All Rights Reserved.

The layers of the environment is the troposphere, the space, the mesosphere, the thermosphere, and exosphere. Troposphere is the layer during which happened and extends from the surface to about to 16 km (about 10 mi) above sea level the equator. Upper troposphere is the space, which has an upper limit of 50 km (30 mi) above the plain sea. The layers 50-90 km (30-60 mi) is called the mesosphere. At a altitude of about 90 km, temperatures begin to rise. The layers beginning with altitude is called the thermosphere due to high temperatures that may reach layer (about 1200 ° C, or about 2200 ° F). The region beyond the thermosphere is called the exosphere the. The thermosphere and exosphere united with other regions of the atmosphere known as the ionosphere, a layer or layers of ionized air extending from approximately 60 km (50 mi) above the surfaces of the world Altitudes of 1,000 km (600 mi) and others.

Earth's atmosphere and the way it interacts with the oceans and radiation from the Sun is responsible for the climate on the planet and time. The environment play a vital role in supporting life. Almost all life on Earth uses atmospheric oxygen for energy in a way known as cellular breath, which is essential to life. The environment also helps moderate Earth's climate by of trapping radiation from the Sun seen from Earth's surface. Water vapor, carbon dioxide, methane, and nitrous oxide in the atmosphere act as "greenhouse gases". Like glass in a greenhouse, they trap infrared, or heat, radiation from the Sun to lower atmosphere and thus help over the warm Earth. No effects greenhouse, heat radiation can escape the space, and Earth will become too cold to support most – way of life.

Other gases in the environment is also important life. The trace amount of ozone present in the Earth's space blocks harmful ultraviolet radiation from the Sun. No ozone layer, life that we know that it is not can survive in soil. Earth's atmosphere is an important part of a phenomenon known as the water cycle or hydrologic cycle. See also the environment.

B The environment and the Water Cycle

The water cycle means that the Earth's water is constantly recycled between the oceans, the environment, and the earth. All water that exists on Earth today are used and reused for billions of years. Very little water is made or lost during this period. Water continues to move to Earth's surface and changing between ice, liquid water, steam and water.

The water cycle begins when the Sun heats The water in the oceans and causes it to evaporate and enter the atmosphere as evaporation of water. Some of this water vapor that falls behind the rain directly oceans, the completing a short cycle. Some water vapor, however, reaching the ground, where it can fall of snow or rain. Melted snow or rain enters of rivers or lakes on earth. Because the strength of gravity, the water in the river finally empties back into the oceans. Melted snow or rain can also enter the ground. Groundwater may be stored for hundreds or thousands of years, but it finally reached over the spring or small pool known as seeps. Although snow means glacial ice or part of the polar caps and will stay out of the cycle for thousands of years later melts or warmed by the Sun and killed in water vapor, entering the environment and falling again as rain. All water that falls to earth eventually return to the ocean, completing the water cycle.

Earth Surface IV

Earth's surface is the outermost layer of the planet. Including hydrosphere, bread, and the biosphere.

An expanse of water

The hydrosphere is composed of the body water covering 71 percent of the surfaces of the World. The largest of these are the oceans, which contain more than 97 percent of all water on Earth. Glaciers and the polar ice cap contains just over 2 percent of Earth's water in the form of solid ice. Only about 0.6 percent under the surface of groundwater. However, groundwater is 36 times more plentiful than water found in lakes, including inland, rivers, and the environment as the steam of water. Only 0017 percent of all water on Earth is found in lakes and rivers. And a voluntary – 0001 percent are located in environments such as steam water. Most water in glaciers, lakes, including within the country, rivers, and groundwater is fresh and can be used for drinking and agriculture. Dissolved salts compose about 3.5 percent of water in oceans, however, making of it unsuitable for drinking or agriculture unless it is considered to remove the salts-drugs.

B bread

The bread is made of continent, other places of the earth, and the BASINS, or floor, to the oceans. The dry land of Earth's surface is called the continental crust. It is about 15-75 km (9-47 mi) thick. The ocean crust is thinner than continental bread. Its average thickness is 5 to 10 km (3 to 6 mi). The bread has a specific called limit Mohorovi

Ocean crust and continental crust differ from the type of stone contains it. There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form when melted rock, called magma, cools and solidifies. Sedimentary rocks are generally created by the breakdown of igneous rock. They tend to form sa layers as small particles of other rock or as the mineralized remains of dead animals and plants that have fused together over time. The remains of the dead animals and plants sometimes became sa mineralized sedimentary rocks and fossils as recognizable. Metamorphic rocks form when igneous or sedimentary rock is changed by heat and pressure deep under the ground.

Ocean crust is composed of dark, dense igneous rock, such as Basalt and gabbro. Continental crust consists of lighter-colored, thicker fiery stone, like granite and diorite. Continental crust also includes metamorphic rock and sedimentary rock.

C Biosphere

The biosphere includes all areas of Earth capable of supporting life. The biosphere from the range of about 10 km (about 6 mi) to the environment in deepest ocean floor. For a long time, scientists are believe that all life depended on energy from the Sun and because it exists only where sunlight penetrated. Sa 1970s, however, scientists discovered various quality of life around hydrothermal vents on the floor of the Pacific Ocean where the sunlight never penetrated. They learned that the first bacteria formed the basis of living this community and that the bacteria from their energy from a process called chemosynthesis not rely on sunlight. Some scientists believe that biosphere may extend relatively deep into the Earth's bread. They have recovered what they believe before bacteria from deep holes drilled below the other surface.

D changes in Earth's surface

Earth's surface is constantly changing since the planet formed. Most of these changes are gradual, taking place over millions of years. However, these gradual changes have resulted in radical changes, involving the formation, erosion, and rebuilding of the mountain range, the movement of continents, creating huge supercontinents, and the breakup of supercontinents smaller continents.

The changes caused by time and erosion resulting from the cycle of water is among the principal objects responsible for changes in surfaces of the World. Another principal factor is the movement the Earth's continents and seafloors and the buildup of the mountain range due to a phenomenon known as tectonics plate. Heat is the basis for all the changes this. Heat in the Earth's interior is believed to be responsible for continental movement, mountain building, and the creation of new seafloor sa BASINS ocean. Heat from the Sun is responsible for the water vapor into the ocean and the rain that results causes weathering and erosion. In effect, heat in the Earth's interior helps build up the Earth's surface while the heat from the Sun helps to wear down the surface.

D1 weathering

Weathering is The damage of kidney and near the surface of Earth. Most stones that originally formed a hot, high pressure environment below the surface where there was little exposure to water. When the stone reaches the Earth's surface, however, they are subjected to changes in temperature and exposed to water. When the kidney is subjected to the kind of conditions above, the minerals they contain often change. These changes constitute the process of change due to weather. There are two types of changes caused by period: physical weathering and chemical weathering.

Physical weathering involves a reduction in size of the stone material. Freezing and thawing of water in rock cavities, for example, Splits stones into small pieces because water expands when it freezes.

Chemical weathering involves a change in chemical composition of the rock. For example, Feldspar, a common minerals in granite and other stones, reacts with water to form the clay minerals, resulting in A new element has completely different characteristics than Feldspar parents. Is the chemical weathering of significance to people because it creates clay that minerals are essential part of the land, the basis of agriculture. Chemical weathering also causes the release of dissolved forms of sodium, calcium, potassium, magnesium, and other chemical substances on the surface water and groundwater. These elements are carried by surface water and groundwater to the sea and the sources of dissolved salts to sea.

D2 erosion

Glacial erosion Glaciers erode earth through processes such as abrasion, crushing, and Fracturing of material to the path glacier's. Glaciers move by growing or shrinking, depending on climate. Moving glaciers eat and transport large quantities of stone, sand and other particles with their paths. The freezing path shown here is a moraine formed by glacier sa Switzerland.Photo Researchers, Inc. / Paolo Koch

Erosion is the process deleted loose and weathered rock and bringing it to a new site. Water, wind, and glacial ice combined with the force of gravity can cause erosion.

Erosion by running water is by far the most common method of erosion. It takes place over a longer period than other form of erosion. When the water from rain or melted snow moving down, it can take loose rock or soil it. Erosion by running water forms the familiar gullies and V-shaped valleys that cut into most landscapes. The power of running water deleted loose particles formed by the change due to weather. Process, gullies and valleys are lengthened, widened and deepened. Generally, water overflows the banks of river channels or gullies, resulting in floods. Each new flood of material containing more far to increase the size of the valley. Meanwhile, weathering loosens more and more material that the process continues.

Erosion of glacial ice is more common, but it can cause the greatest landscape changes in the shortest amount of time. Glacial ice forms in a region which failed to melt snow in spring and summer and instead builds up the ice. For the large glaciers in this form, lack of snowmelt is to occur for a number of years in areas with high rain. As the ice accumulates and thickens, the flow as a solid mass. Because it flows, it has a tremendous ability to eat soil and steady rock. Ice is a major factor in shaping some landscapes, especially in mountainous regions. Glacial ice provides plenty of spectacular scenery in this region. Features such as horns (sharp mountain peaks), ar

Wind is an important cause of erosion only arid (dry) region. Wind carries sand and dust, can be scrubbed even solid rock.

Many factors determine the rate and type of erosion that occurs in one place. The climate of a place determines the distribution, the amount and type of precipitation that the area receives and therefore the type and rate of weathering. An area with arid climate erodes different than an area with a humid climate. Increased an area also play a role by determining the potential power of running water. The higher the elevation the more water will flow energetically For the force of gravity. The type of bedrock in an area (sandstone, granite or slate) can determine the shape of valleys and slopes, and the depth of the medium.

A views of the geologic-age, how long the current conditions of weathering and erosion have affected the area-determines the overall look. Relatively new landscapes likely to be stronger and angular sa form. Older landscapes tend to have more rounded slopes and hills. The oldest landscapes tend to be a low lying area, open river valleys and low, rounded hills. The overall effect of wearing down an area of level ground; customers leads to reduction of all the land above the plains sea.

D3 Photo tectonics

Against this to customers is a leveling force responsible for raising the mountains and plateaus and for creating new landmasses. The change in Earth's surface occur in maximum stable part of the Earth, known as the lithosphere. Lithosphere consists of bread and other regions known as the upper mantle and is approximately 65-100 km (40-60 mi) thick. Compared within the Earth, however, the region is relatively thin. Lithosphere is thinner in proportion than the entire Earth in the skin of the apple is the apple.

Scientists believe that the lithosphere is broken in a series of plates, or segments. According to the theory of plate tectonics, these plates move around Earth's surface over a long period of time. Tectonics comes from the Greek, tektonikos, which means "builder."

According to theory, the lithosphere is divided into large and small plates. The largest plates include the Pacific plate, the plate North America, the Eurasian plate, the Antarctic plate, the Indo-Australian plate, and the African plate. Smaller plate include the Cocos plate, the Nazca plate, The Philippine plate, and the Caribbean plate. Image sizes vary a great deal. The Cocos plate is 2,000 km (1,000 mi) wide, while the Pacific plate is approximately 14,000 km (almost 9000 mi) wide.

The plates move in three different ways in relation to each other. Pull them apart or move away from each other, they collide or move against each other, or they slide past each other as they move sideways. The movement of the plates helps to explain many geological events, such as earthquakes and volcanic eruptions as well as mountain building and the formation of oceans and continents.

? I? prevention, or simply a moho. The border separates the crust from the underlying mantle, which is thicker and is part of Earth's interior.êtes (sharp ridges), glacially formed lakes, and U-shape valleys all the result of glacial erosion. About the Author

My name is MIAN AFAQ TARIQ. I am student of 2nd year in MTB Higher Secondry School. I am living in Sadiqabad(PAKISTAN). My contect numbers are 03342527785 and 03023357300.