What is retrograde metamorphism?
Answer to relevant QuestionsWhat is a hornfels?What is hydrothermal alteration?Metamorphism occurs at depth. Since geologists cannot see this going on, can they apply the axiom of “the present is the key to the past”?Why don’t coal, oil, and natural gas fit the accepted definition of a mineral? (See Problem 2.21)What thickness of cover rock is generally thought necessary to generate petroleum and natural gas from organic material?
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