The Earth's crust is broken into plates that lie over the mantle. Because the mantle is hotter toward the interior and cooler toward the exterior, convection currents occur, which causes the plates to move above them. ... Volcanoes, earthquakes and mountain building or orogeny are found along plate boundaries.
The Earth's crust is broken into plates that lie over the mantle. Because the mantle is hotter toward the interior and cooler toward the exterior, convection currents occur, which causes the plates to move above them. ... Volcanoes, earthquakes and mountain building or orogeny are found along plate boundaries.
