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Unformatted text preview: rocks. Rocks are divided into classes depending upon the manner in which they form. 1. Igneous rocks – form when magma crystallizes or volcanic ejecta (such as ash) accumulates and consolidates. 2. Sedimentary rocks – form by consolidation of minerals or rock fragments or precipitation from solution. 3. Metamorphic rocks – form from the alteration of other rocks by heat, pressure, and the chemical activity of fluids. The Rock Cycle – illustrates the inter-relationships between the rock groups as they are subjected to continual change through time....
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- Spring '08
- Rock Cycle, streak hardness cleavage