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Geology.com features a collection of classroom activities and lesson plans. Browse through topics covering astronomy, earthquakes, erosion, maps, plate tectonics, rocks and minerals, volcanoes, water, and weather.
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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Sinkholes are natural depressions in the land caused when limestone and soils dissolve. They form when groundwater removes rock underground. They can form by slow gradual sinking or by sudden collapse of an underlying hole. Sinkholes are common in about one quarter of the U.S. You can usually...
Grade Level   6 7 8 9 10
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