15.1 Life in the Earth System
[Pages:4]15.1 Life in the Earth System
KEY CONCEPT The biosphere is one of Earth's four interconnected systems.
15.1 Life in the Earth System
The biosphere is the portion of Earth that is inhabited by life. ? The biosphere includes all ecosystems.
? one of Earth's systems
? includes the biota, all the living things in the biosphere
15.1 Life in the Earth System
? There are three other Earth systems.
? hydrosphere--water, ice, and water vapor
? atmosphere--air blanketing Earth's solid and liquid surface
? geosphere--geologic features above and below Earth's surface
15.1 Life in the Earth System
Biotic and abiotic factors interact in the biosphere.
? All four Earth systems are interconnected.
? The Gaia hypothesis considers Earth as a kind of living organism. ? Earth systems interact to yield a biosphere capable of supporting life. ? It was developed by James Lovelock and Lynn Margulis.
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