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Millions of organisms can live in and around a body of water.

This activity (on pages 23-27) lets learners simulate the work of scientists who take core samples of Earth's rocky layers to determine geological history.

In this activity, two groups of learners create two separate landform models out of clay (mountains and valleys).

In this activity, learners use sand and ice cubes to create a model of permafrost and the effects of the ice melting through the surface.