Treasures of the Earth: The Earth's Crust and its Minerals
7 months ago
61
Shows how forces act on the earth's crust to cause changes in it and how minerals are concentrated as a consequence of these changes by various means: by being deposited in veins, by washing into stream beds, seeping through the earth and more. Describes how oil, copper, iron, coal, natural gas and other minerals were formed. Great film!
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