GEOLOGY

Detailed explanation-1: -At constructive plate boundaries, the tectonic plates are moving away from one another. The Earth’s crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface. Volcanoes can sometimes form in these setting; one example is Iceland.

Detailed explanation-2: -Tectonic activity such as earthquakes, volcanic eruptions and the formation of mountain ranges commonly occurs along the boundaries of the moving plates.

Detailed explanation-3: -Rift volcanoes. Rift volcanoes form when magma rises into the gap between diverging plates. They thus occur at or near actual plate boundaries.

Detailed explanation-4: -Magma rises from the hot spots and erupts as lava through cracks in the Earth’s surface forming volcanoes. As a plate moves slowly across a hot spot, a chain of volcanoes or volcanic islands can form.