Which is a mixture? a. Red and blue marbles in the same container
b. A tin can that cannot be broken down into Simpler substances
c. A piece of iron reacting chemically with oxygen
d. hydrogen and oxygen atoms forming a molecule

What’s the scientific notation for the number 6,840,000,000

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.

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.