Stone Age - Wikipedia, the free encyclopedia
The Stone Age is a broad prehistoric period during which stone was widely used to make implements with a sharp edge, a point, or a percussion surface.
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The Stone Age is a broad prehistoric period during which stone was widely used to make implements with a sharp edge, a point, or a percussion surface.
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احصل على السعر >>Measures to Conserve the Land Resources: Degradation of land can be prevented by taking following measures: Afforestation; Proper management of grazing.
احصل على السعر >>A stone tool is, in the most general sense, any tool made either partially or entirely out of stone. Although stone tool-dependent societies and cultures still exist ...
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احصل على السعر >>Glossary of Stone Terms . abrasive hardness (Ha) A measure of the wearing qualities of stone for floors, stair treads, and other areas subjected to abrasion by foot ...
احصل على السعر >>THE USES OF POTTERY 67 the second and first millennia, but if they were made of metal it is not likely that they would have survived because of their value for re-use ...
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احصل على السعر >>grind (grīnd) v. ground (ground), grind·ing, grinds. v.tr. 1. a. To crush, pulverize, or reduce to powder by friction, especially by rubbing between two hard ...
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احصل على السعر >>grit (grĭt) n. 1. Minute rough granules, as of sand or stone. 2. The texture or fineness of sand or stone used in grinding. 3. A coarse hard sandstone used for ...
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