Question

According to the mantle plume model, hot-spot plumes a. are thought to originate at the crust-mantle boundary. b. stream upward quickly because their hot rock is less dense than the overlying rock. c. partially melt the base of the overlying lithosphere, and the magma that is formed rises toward the surface. d. produce volcanoes that always coincide with a plate boundary.

Answer 1

partially melt the base of the overlying lithosphere, and the magma that is formed rises toward the surface.