Lesson 5.docx - Lesson 4 For a metamorphic rock is it always possible to determine the original parent rock prior to metamorphism Why or why not List

Lesson 5.docx - Lesson 4 For a metamorphic rock is it...

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Lesson 4 For a metamorphic rock, is it always possible to determine the original parent rock prior to metamorphism? Why or why not? List three parent rocks and give a possible metamorphic equivalent for each one. It is not always possible to determine the original parent rock, there are many stages which a rock can take underneath the Protolith stage which can sometimes be very difficult to identify the prototype rock. A rock can also go under many different masks of metamorphism and be rich of minerals. There are three metamorphic equivalents, contact, regional, and dynamic metamorphism. Granite as an example for a parent rock can be a metamorphic equivalent of Gneiss. Shale as an example of a parent rock could be a metamorphic equivalent of Slate. Sandstone can be a metamorphic equivalent of Quartzsite. Lesson 5 Compare and contrast mechanical and chemical weathering. What is the importance of each in the breakdown of rocks? What are the processes operating in each? How do they work together?
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Unformatted text preview: Chemical weathering always changes at least one mineral in a rock as for mechanical weathering, it breaks fragments of a rock without changing the minerals of a rock. Both mechanical and chemical weathering keep some of the same minerals but each process alters it in a different way. It is important for the break down of rocks for both chemical weathering and mechanical weathering to work together. Mechanical weathering for examples breaks down rocks into smaller segments, making is a wider area for chemical weathering to take place and easier for it to break a rock down since it will be weaker and smaller. This process repeats itself. You did not discuss the processes operating in each. For mechanical you should have discussed frost wedging, unloading, salt crystal growth, thermal expansion, and biological activity. The most common factor in chemical weathering is water and the forms of chemical weathering are dissolution, hydrolysis, and oxidation...
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