Question

along some plate boundaries, continual eruptions occur and cooling lava hardens into new sea - floor rock. as more sea - floor rock forms, older rock is pushed away. this is known as sea - floor spreading. where does sea - floor spreading occur? choose 1 answer: a at the divergent boundaries of mid - ocean ridges b at the convergent boundaries of mid - ocean ridges c at the divergent plate boundaries of island arcs d at the convergent plate boundaries of island arcs

Explanation:

Sea - floor spreading occurs at divergent plate boundaries. Mid - ocean ridges are areas of divergent plate boundaries where new sea - floor rock is formed as lava erupts and cools. Island arcs are associated with convergent plate boundaries and subduction zones, not sea - floor spreading.

Answer:

A. at the divergent boundaries of mid - ocean ridges