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Describe the four main spheres of Earth. 1.lithosphere 2.hydrosphere 3.atmosphere...

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jarmel | Student, Undergraduate | eNotes Newbie

Posted April 1, 2010 at 10:00 PM via web

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Describe the four main spheres of Earth.

1.lithosphere 2.hydrosphere 3.atmosphere 4.biosphere

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Michelle Ossa | College Teacher | (Level 3) Educator Emeritus

Posted April 1, 2010 at 10:17 PM (Answer #1)

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The four spheres show how the four main components of Planet Earth form a complete system. These main components are land, air, water, and life.

The lithosphere, also known as Geosphere is made of the earth's core, the mantle, crust, ocean floor,mountains, sand, rocks, alphalt, bricks, etc.

The hydrosphere is made of everything water such as oceans, rivers, lakes, rain, snow, and ice caps.

The atmosphere is made of gasses such as oxygen, hydrogen, water vapor, ozone, and the wind.

Finally the biosphere is all that has life such as plants, animals, people, insects, microbes, etc.

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krishna-agrawala | College Teacher | Valedictorian

Posted April 1, 2010 at 10:26 PM (Answer #2)

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Lithosphere of the earth is the outer solid crust on the earth's surface, that surrounds the hot molten core of the earth. The lithosphere consists of about 30 small and large pieces called plates that are continuously but very slowly moving on the very hot rocks below it. These hot rocks constitute the athenosphere of the earth.

Atmosphere of the earth refers to the layer of air that surrounds the solid crust of the earth. The atmosphere extents as far as 1600 kilometers above the surface of earth. Nitrogen makes up about 78% and oxygen about 21% of the gases present in earth's atmosphere. The remaining part consists mainly of Argon and small amount of many other gases, water vapour and dust particles. The lower part of the atmosphere is called troposphere. All clouds exist in the troposphere, and various weather conditions like wind and storms also take place in it. At altitude of about 1600 kilometers the atmosphere gradually fades into empty space.

Hydrosphere of the earth refers to all the bodies of water and ice on the surface of the earth as well as the water vapour in its atmosphere. Hydrosphere makes up about three fourths of the earth's surface.

Biosphere of the earth refers to the regions of erth where life forms such as animals and plants live. These include the surface of the earth and areas close to the surface.

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omarforever | Student , Grade 11 | Honors

Posted February 14, 2012 at 8:40 AM (Answer #3)

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