Rocks and minerals
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Describes the three classes of rocks - igneous, sedimentary and metamorphic - and relates them to the natural conditions that produced them. Explains the varied uses of rocks and minerals in their natural state, including basalt, pumice, granite, limestone, sandstone, marble and others.
Sources
- 16mm Filmography (legacy record) — title, description, catalog record
Original permalink · Record added 2026-01-23 03:59:31