Volcanoes and Plate Boundaries

Science, Grade 6


Table Of Contents: Volcanoes and Plate Boundaries

1. Volcanoes at Plate Boundaries
Most of the Earth's volcanoes are located at tectonic plate boundaries. These volcanoes are found on both continental and oceanic crust.
2. Ring of Fire
The belt of volcanoes along the boundary of the Pacific Ocean is called the Ring of Fire because it contains about 75% of the world's active volcanoes.
3. Volcanoes at Divergent Boundaries
Mid-ocean ridges form from lava pouring onto the ocean floor at divergent plate boundaries. On land, divergent boundaries produce chains of active volcanoes.
4. Volcanoes at Convergent Boundaries
At convergent boundaries, oceanic plates are subducted and magma forms from melting crust. Eruptions create volcanic island arcs in the ocean and volcanic mountain ranges on land.
5. Hot Spot Volcanoes
Some volcanoes form over hot spots that are not located along plate boundaries. A hot spot occurs when rising magma is close to the Earth's surface. The islands of Hawaii were formed over a hot spot in the Pacific Ocean.