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(from Greek bios = life, sphaira, sphere) is the layer of the planet Earth where life exists. 

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(from Greek bios = life, sphaira, sphere) is the layer of the planet Earth where life exists. 

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the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.

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the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.

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A tsunami is a catastrophic event in the hydrosphere

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A tsunami is a catastrophic event in the hydrosphere

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a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.

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a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.

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a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.

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a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.

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a long high sea wave caused by an earthquake, submarine landslide, or other disturbance.

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a long high sea wave caused by an earthquake, submarine landslide, or other disturbance.

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The hydrosphere includes both salt and fresh water, with the majority of the hydrosphere on Earth being in a salt water form.  Water, along with the combination of gases being expelled into the Earth, contributes to the Earth's hydrosphere.

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The hydrosphere includes both salt and fresh water, with the majority of the hydrosphere on Earth being in a salt water form.  Water, along with the combination of gases being expelled into the Earth, contributes to the Earth's hydrosphere.

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Rigid outer part of the earth, consisting of the crust and upper mantle. Composed of rocksin the crust and upper mantle that behave as brittle solids. The rigid lithosphere sits on top of the asthenosphere, a layer of the mantle in which rocks are hot and deformable.

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Rigid outer part of the earth, consisting of the crust and upper mantle. Composed of rocksin the crust and upper mantle that behave as brittle solids. The rigid lithosphere sits on top of the asthenosphere, a layer of the mantle in which rocks are hot and deformable.

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THE COMPOSITION OF OUR ATMOSPHERE.   Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.

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THE COMPOSITION OF OUR ATMOSPHERE.   Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.