Glaciers had created the Great Lakes.
-Rhear
magma, rises through cracks and erupts to form volcanoes. The answer id D. Hotspot volcanism would thus be unique because itdoes not occur at the boundaries of Earth's tectonic plates, where other volcanism occurs.
A common rock type found within oceanic crust is called basalt rocks. It is dark just like an igneous rock and it is basically a type of lava from a volcano.
