Front

Atmosphere

Back

The layer of gases surrounding Earth.

Front

Biodiversity

Back

The variety of life on Earth, including plants, animals, microorganisms, and their ecosystems.

Front

Biosphere

Back

The part of Earth where life exists, including all living organisms and their interactions with the environment.

Front

Geosphere

Back

The solid, non-living part of Earth, including rocks, minerals, and soil.

Front

Hydrosphere

Back

All of Earth's water, including oceans, lakes, rivers, groundwater, and ice.

Front

Surface water

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Water found on the Earth's surface, such as rivers, lakes, and oceans.

Front

Watershed

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A region of land that drains into a particular river, lake, or ocean.

Front

Continental crust

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The thicker, less dense crust that makes up the continents.

Front

Core

Back

The central part of Earth, composed primarily of iron and nickel.

Front

Crust

Back

The outermost layer of Earth, made of solid rock.