Most of the world's volcanoes are found around the edges of tectonic plates, both on land and in the oceans. On land, volcanoes form when one tectonic plate moves under another. ... When enough magma builds up in the magma chamber, it forces its way up to the surface and erupts, often causing volcanic eruptions.

Do tectonic plates have anything to do with volcanoes?

Most volcanoes form at the boundaries of Earth's tectonic plates. These plates are huge slabs of the Earth's crust and upper mantle, which fit together like pieces of a puzzle. ... Sometimes, the plates collide with one another or move apart. Volcanoes are most common in these geologically active boundaries.

Does plate tectonics cause volcanoes and earthquakes?

The theory of plate tectonics describes the motion of Earth's plates and their role in geological processes, such as mountain building, earthquakes, and volcanoes. ... At an oceanic–continental convergence, the melt rises to form volcanic mountains—a volcanic arc—on the overlying continental crust.