20. Give 2 examples of chemical rocks. 21. How are organic sedimentary rocks formed? 22. Give 2 examples of organic rocks. 23. Define Metamorphic rock. . 24. What does foliated mean? . 25. Give an example of a foliated rock. Rock can follow many different pathways through the rock cycle. Here are two examples: Pathway 1 Between New Zealand and South America, at the bottom of the Pacific Ocean, Molten material from the mantle rises through the crust. As the material comes into contact with the very cold ocean water, it cools quickly to become rock. Over time this rock ever so slowly moves across the ocean floor. About 200 million years later, the rock is pushed downwards. As the rock moves downward, it experiences great amounts of heat and pressure. Pathway 2 Deep underground, a new rock forms as heat and pressure change its crystals and cause its grains to become foliated. Over millions of years, this rock is uplifted to become part of a mountain. Then, layers of rock above the foliated rock wear away, until it becomes exposed at the surface. Destructive forces wear it down, and its fragments are carried away by a river’s swift-flowing water. Eventually, these fragments flow into the ocean. Ocean water carries the rock fragments away from the river and they are deposited on a beach. Over time, more and more sediment is deposited there, until the fragments that came from the foliated rock become cemented into a new rock. Then more and more rock
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- Fall '15
- Ms. Moran
- Pacific Ocean, rock labs