What happens in a subduction zone? a. Two plates slide past each other and cause earthquakes.
b. Two plates come together of different densities and one sinks under the other and melts.
c. Two oceanic plates diverge and create a ridge.
d. Two continental plates collide and form mountains.

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.