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UNIT 5�EARTH'S STRUCTURE

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ATMOSPHERE

  • What is above us?

Three main spheres of our planet; atmosphere, exosphereand, hydrosphere.

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LAYERS OF THE ATMOSPHERE

-Troposphere: closest to Earth's surface, a lot of oxygen, weather occurs here.

-Stratosphere: ozone layer absorbs the harmful ultraviolet radiation from the sun.

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-Mesosphere: meteors burn in this layer, the top of the is the coldest part of the atmosphere.

-Thermosphere: temperature is very high because solar activity influences it.

-Exosphere: is the outermost layer. The satellites orbit Earth.

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AIR COMPOSITION

Az* : 78%

Na*: 21%

Am*: 1%

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*nitrogen

*oygen

*carbon dioxide, water

vapour, anrgon and ozone

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GEOSPHERE

  • What is solid part of the Earth?

The Geosphere is the solid sphere of our planet. It has three main parts:

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1. Crust: surface of the Earth.

2. Mantle: the thickest layer of the Earth.

3. Core: the hottest layer of the Earth.

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HYDROSPHERE

  • What is all of Earth's water located?

Ocean, lakes, rivers, swamps, glaciers, ice caps.

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  • What are the processes of the water cycle?

1. Evaporation: liquid water becomes water vapour.

2. Transpiration: plants absorbs water from soil through the roots. Water escapes into the air as water vapour.

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3. Condensation: gas is changedc into liquid.

4. Precipitation: water falls from the air as rain, hail or snow.

5. Surface run-off:

Water from precipitation runs off the surface of the Earth into lakes, streams, rivers and oceans.

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6. Infiltration: some water infiltrates through porous land surface into the ground and recharges ground-water aquifers.

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The End�By: Juan Carlos Frías Arenas