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Biosphere

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The Biosphere
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Vocabulary

atmosphere

atmosphere

Layer of gases that surrounds a planet; held in place by gravity.
biosphere

biosphere

Part of Earth that supports life, including the crust, water, and atmosphere.
Gaia hypothesis

Gaia hypothesis

Concept of Earth as a self-regulating living thing.
homeostasis

homeostasis

Tendency of a system to maintain a stable internal environment.
hydrosphere

hydrosphere

Combined mass of water found on, under, and over the surface of a planet.
lithosphere

lithosphere

Rigid outermost shell or layer of a rocky planet; land is part of the lithosphere.

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