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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