Volcanoes and Plate Tectonics Answers

A is a divergent boundary (mid-ocean ridge), and B is a convergent subduction boundary where the oceanic plate sinks beneath the continental plate.

Volcanoes can form at both locations: at A, magma rises at a divergent oceanic plate boundary; at B, an oceanic plate subducts beneath a continent at a convergent boundary, producing magma and volcanoes.

Volcanoes form at A, a divergent mid-ocean ridge, and at B, a convergent subduction zone where the oceanic plate sinks beneath the continent.

The Ring of Fire is a roughly ring-shaped belt around the Pacific Ocean where many volcanoes and earthquakes occur. It is caused mainly by tectonic plate boundaries, especially areas where oceanic plates subduct beneath other plates.

The Hawaiian Islands formed over a hot spot, or mantle plume, rather than at a plate boundary. Hot mantle rises and melts through the moving Pacific Plate, creating volcanoes; as the plate moves, it forms a chain of islands.

Volcanoes form at A, a divergent boundary where plates separate and magma rises, and at B, a convergent subduction boundary where the oceanic plate sinks beneath the continent and produces magma.

Volcanoes form mainly at convergent boundaries, especially where one plate subducts beneath another, and at divergent boundaries, where plates move apart and magma rises to the surface.

Both types of boundaries allow magma to form and rise. At convergent boundaries, a subducting plate releases water that helps melt the mantle. At divergent boundaries, separating plates reduce pressure on the mantle, causing it to melt and produce magma.

A is a divergent boundary where rising magma forms new oceanic crust; B is a convergent subduction zone where a sinking oceanic plate produces magma that rises to form continental volcanoes.

Volcanoes like those at B can be found in the Cascade Range of the Pacific Northwest, especially in Washington and Oregon.