A mixture of gases surrounds a planet, moon or other celestial body.

The mostly solid rocky part of the earth; extends form the center of the core surface of the crust.

A portion of earth that is water.

the part part of earth where life exists; includes all of the living organism on earth.

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Earth Spheres

Term	Definition
Atmosphere	A mixture of gases surrounds a planet, moon or other celestial body.
Geosphere	The mostly solid rocky part of the earth; extends form the center of the core surface of the crust.
Hydrosphere	A portion of earth that is water.
biosphere	the part part of earth where life exists; includes all of the living organism on earth.