1) Sands are formed due to breaking down of a) glass b) wood c) rocks 2) The formation of canyons take a) many years b) Few hours c) Few days 3) The deep, narrow valley with slow at its sides and often with water streams flowing through it , is known as. a) Canyon b) Animals c) Rocks 4) The erosion of sand the castle is considered fast change. a) true b) false 5) The surface of the Earth changes from time to time. a) true b) false

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