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Understanding the Rock Cycle and Fossils: A Geological Analysis

Explore the formation of igneous, metamorphic, and sedimentary rocks in the rock cycle. Learn about the role of fossils and radioactive dating in determining the age of geological specimens.

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Understanding the Rock Cycle and Fossils: A Geological Analysis

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  1. The Rock Cycle

  2. Igneous Rocks • Form from the crystallization of molten material • Extrusive: smooth and glassy • Ex: Basalt • Intrusive: cool slowly, develop large crystals • Ex: Granite First Rocks on Earth were Igneous

  3. Metamorphic Rocks • Form when other rocks are exposed to high temperatures and pressures • Examples: quartzite, marble, slate, gneiss

  4. Sedimentary Rocks • Formed from the products of erosion and weathering of other rocks • Two Types • Clastic: particles of weathered rock • Ex: Limestones,gypsum, sandstone • Carbonates: fragments of marine organisms • Ex: coal, shale FOSSILS

  5. Fossils Radioactive Dating How old something is in comparison Uses carbon isotopes to determine an exact age of the fossil

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