Which best explains a primary reason for the inability of life to exist in Earth’s early atmosphere? A. There was insufficient energy from material collisions to change their density.
B. High temperatures during Precambrian time caused surface water evaporation. C. Volcanic eruptions and comet collisions added different gases to the atmosphere D. Available oxygen was used to help create an ozone layer within Earth’s atmosphere.
FAST PL >_

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.