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Basic geometric forms such as cubes, octahedra, rhombohedra, and tetrahedra may be made by folding flat paper or envelopes, both reasonably priced starting materials. These may be used to help visualize solid forms in crystallography and mineralogy and numbers of them may be used to create unit...
Grade Level   6 7 8 9 10 11 12
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Geologists take advantage of decay of natural radioactive elements to determine the age of rocks, which can help us understand earth history. One example of this dating method is using volcanic ash layers to help determine the age of ash-bearing horizons in ice cores. Ice cores provide important...
Grade Level   4 5 6 7 8 9 10 11 12
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