Mantle comprises magma in it and when it gets through holes in the crust of the planet, it creates volcanic eruptions. Thus, it exerts lava when erupts onto Earth's surface.
Hotspots and geysers transfer heat from the Earth's mantle to the Earth's surface. Heat transfer from tectonic plates and the mantle is found below the Earth's crust. So heat in the mantle comes from the crust.
A hot spot is inside the Earth's mantle that exerts heat due to the convection process. This heat melts of rock of the lithosphere base, which is the upper portion where the mantle meets the Earth's crust.
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