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Rocks and the Rock Cycle

Rocks and the Rock Cycle. Objective 8-3.4. Explain how igneous, metamorphic, and sedimentary rocks are interrelated in the rock cycle. Rocks. There are three large classifications of rocks– igneous, metamorphic, and sedimentary.

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Rocks and the Rock Cycle

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  1. Rocks and the Rock Cycle

  2. Objective8-3.4 Explain how igneous, metamorphic, and sedimentary rocks are interrelated in the rock cycle.

  3. Rocks • There are three large classifications of rocks– igneous, metamorphic, and sedimentary.

  4. Each type of rock is formed differently and can change from one type to another over time.

  5. Igneous Rock Forms when molten rock (magma) cools and hardens.

  6. Igneous Rock If cooling takes place slowly beneath Earth’s surface, the igneous rock is called intrusive.

  7. Igneous Rock If the cooling takes place rapidly on Earth’s surface, the igneous rock is called extrusive.

  8. Metamorphic Rock • Forms when rocks are changed into different kinds of rocks by great heat and/or pressure – they are heated, squeezed, folded, or chemically changed by contact with hot fluids.

  9. Pictures of Metamorphic Rock

  10. Sedimentary Rock Forms from the compaction and/or cementation of rock pieces, mineral grains, or shell fragments called sediments.

  11. Sediments are formed through the processes of weathering and erosion of rocks exposed at Earth’s surface.

  12. Sedimentary rocks can also form from the chemical depositing of materials that were once dissolved in water.

  13. Rock Cycle • The rock cycle is an ongoing process.

  14. The sample diagram illustrates the series of natural processes that can change rocks from one kind to another:

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