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The Earth as a System

The Four Great Realms 

Interaction between Earth's spheres

The Stuff of the Universe - Cycles 

Matter is constantly recycled on earth 

Population and the Environment 

The Atmosphere

Where are we now, and where are we going? 

See Also: Climate, Weather, Environment, Water Cycle 

For Kids

Where is the hydrosphere? 

Our Great Lakes - part of the hydrosphere 

The Atmosphere 

A Visual model of Earth's spheres

For Teachers

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