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I was reading about the Earth's structure and learned that the mantle is solid, although it can deform plastically. In fact this follows from possibility of transversal seismic waves to propagate.
This leaves me with the question where the magma that we observe in volcanos is formed and how much there is present at the crust-mantle boundary.
This leaves me with the question where the magma that we observe in volcanos is formed and how much there is present at the crust-mantle boundary.