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>> **c. Describe ways that the following processes contribute to changes always occurring to the earth’s surface.** >> Return to Rocks & Minerals
 * . ** Explain how rock is formed from combinations of different minerals and that smaller rocks come from the breakage and weathering of bedrock (solid rock underlying soil components) and larger rocks; soil is made partly from weathered rock, partly from plant remains—and also contains many living organisms **
 * **a. Observe and classify a collection of minerals based on their physical properties (color, luster, hardness, and streak).** **b. Identify components of a variety of rocks and compare the physical properties of rocks with those of minerals to note major differences**
 * **Erosion**
 * **Weathering**
 * ** Deposition **

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