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| #3622220 in Books | 1990-02-28 | Ingredients: Example Ingredients | Original language:English | PDF # 1 | 11.00 x9.00 x.50l,.0 | File type: PDF | 144 pages|
Each gem deposit-whether of primary origin in the parent rocks; or secondary as alluvial placers in valley floors, river gravels, or the sand of oceanic shelves presents an eloquent chronicle of the Earth's life story. It reveals to the expert the prodigious processes which formed the present crust of our planet, of which this volume discloses a small but exciting detail. The materials of the Earth's crust are the rocks. In this book, the author expounds on how they...
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