Evaporating soil water ____
a. can only move downward
b. is responsible for creating caliche
c. is bound to the surface of soil particles by strong electrical forces
d. is the primary agent in transporting soil particles from one level to another
b
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A volcanic rock with a glassy texture commonly has experienced ________ cooling. Fill in the blank(s) with the appropriate word(s)
The evolution to an oxygen-rich atmosphere:
A) was heavily dependent upon aerobic bacteria. B) would have occurred even if carbon dioxide had not been present. C) occurred at the same time the atmospheric levels of carbon dioxide were decreasing. D) required large amounts of atmospheric nitrogen.
Why are silicate minerals the most common minerals in the crust?
A) because oxygen and silicon are the most common elements in the crust B) because carbonate and oxide minerals are more easily weathered C) because their building block is in the shape of a tetrahedron D) because they include elements such as magnesium, sodium, and potassium
Which of the following pH's corresponds to a slightly basic solution?
A) 2.8 B) 6.8 C) 7.2 D) 11.2