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Pictures of deforestation,  · Illegal sand and gold mining Peatlands destruction in Riau [riau_1076] Patchwork of legal forest reserves, pasture, and soy farms in the Brazilian Amazon Canal in the Borneo peat forest Cleared forest inside Tesso Nilo National Park [indonesia_20151662] ...How to Polish Stones: 13 Steps (with Pictures),  · How to Polish Stones. Rock collecting can be an enjoyable hobby for both adults and children. It's inexpensive to do and a great way to get out and enjoy nature. If you have young children, it's also a nice way to teach them about science....P&Q University Lesson 3,  · Some areas are devoid of sand and gravel, and some potential sources of crushed stone may be lacking or covered by overburden that is too thick to allow economical surface mining. In some areas, moreover, aggregate does not meet the physical-property requirements for certain uses, or it contains mineral constituents that react adversely when used in cement concrete.How to Polish Quartz Crystals: 12 Steps (with Pictures),  · You'll want to work up to finer and finer grades of sand paper. Once you finish with the 50 grade sandpaper, rub the crystal down with 150 grade sandpaper. From there, move on to the 300 to 600 grade sand paper. Once again, rub the stone gently through its ...