magmas

Why are magmas produced by partial melting more felsic than the source rock?

True or False: Climate change and warming average global temperatures will result in glacial retreat?  Explain your answer using the glacial budget. Some continental crust rocks are almost 4.2 billion years old. Meanwhile, the oldest seafloor rocks are only about 180 million years old. Why do we not find older seafloor rocks? Is melt all […]

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