About 50 percent of the 125,000 (30,000 ) of freshwater in lakes is
A) located in just seven lakes.
B) located in the 40 largest lakes.
C) saline.
D) in the Great Lakes.
A
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Which group of silicate minerals has two planes of cleavage that are oriented at approximately 60° and 120°?
A) Pyroxenes B) Potassium Feldspars C) Amphiboles D) Galena
Deserts and steppes occur at middle latitudes because of ________
A) rising air currents B) high temperatures C) subsiding air currents D) mountains that block the moisture and long distances from the oceans
Dark maria on the Moon are formed by?
A. Basalt flows filled previously existing impact craters. B. Shallow magma baked the overlying rocks. C. Volcanic calderas released hot water and hydrothermal minerals. D. Running water deposited hematite-rich sediments in low areas.
Major U.S. airports are typically among the organizations least responsible for pollution.
Answer the following statement true (T) or false (F)