The very common carbonate mineral shown here that is a clear to light-gray color is
A) calcite.
B) dolomite.
C) hematite.
D) magnetite.
E) pyrite.
A) calcite.
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A solution of NaCl has a sodium ion concentration of 150. ppm. What is the chloride ion concentration in this solution?
A) 97.0 ppm B) 150. ppm C) 232 ppm D) 300. ppm
The strategic importance of the Middle East is mostly related to
A. the tension between Israel and the Palestinians. B. its location along the international trade route between Europe and Asia. C. its enormous known reserves of petroleum. D. the interaction between moderate and radical Islamic states.
One way to deal with the creation of solid wastes is to reduce the environmental impact without trying to reduce the amount of waste produced. This is called ____.
A. waste reduction B. waste recycling C. secondary pollution prevention D. primary pollution prevention E. waste management
The only substance near Earth's surface that is found naturally in the current atmosphere as a solid, liquid, and a gas is
a. carbon dioxide. b. water. c. molecular oxygen. d. ozone. e. carbon.