Luisa has two older brothers and a younger sister. She had been learning about how to describe the ages of rocks. After thinking about it, she realized she could compare people's positions in her family in the same way that scientists compare rocks. Which geology term would describe the way Luisa compares the positions of people in her family? a. absolute age
b. rock layers
c. relative age
d. superposition

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.