Question

source: united states geological survey
volcanoes are scattered randomly across earth.
volcanoes are only located along edges of continents.
volcanoes are mostly located along boundaries between plates.
volcanoes are distributed equally in the northern and southern hemispheres.

Explanation:

Volcanism is closely related to plate - tectonic activity. Most volcanoes form along plate boundaries such as divergent and convergent boundaries. Divergent boundaries allow magma to rise, and convergent boundaries involve subduction which can lead to melting and volcanic activity. The image shows active volcanoes located near plate boundary lines.

Answer:

Volcanoes are mostly located along boundaries between plates.