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12.15: The Biosphere

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
atmosphere Layer of gases that surrounds a planet; held in place by gravity.
biosphere Part of Earth that supports life, including the crust, water, and atmosphere.
Gaia hypothesis Concept of Earth as a self-regulating living thing.
homeostasis Tendency of a system to maintain a stable internal environment.
hydrosphere Combined mass of water found on, under, and over the surface of a planet.
lithosphere Rigid outermost shell or layer of a rocky planet; land is part of the lithosphere.

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Description
Difficulty Level:
At Grade

Concept Nodes:

Grades:
7 , 8
Date Created:
Nov 29, 2012
Last Modified:
Sep 11, 2016
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SCI.LSC.511.1.L.1