The refraction of sound normally occurs in
A. air.
B. water.
C. both of these
D. none of the above
Answer: C
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Continental crust is very buoyant compared with oceanic crust because continental crust is
A. predominantly composed of basaltic rock that contains many air bubbles from successive lava flows. B. very young and fresh. C. thinner than the oceanic crust, forming a thin upper skin on the oceanic crust below. D. predominantly composed of granitic rocks, whereas oceanic crust is composed of basaltic rocks.
Poorly sorted, nonstratified drift deposits are called ____________________. Fill in the blank(s) with the appropriate word(s)
A chemical or biogenic sedimentary rock consisting of gypsum is called
A) chert. B) rock salt. C) rock gypsum. D) dolostone.
China has 20% of the world's population but only 2% of the world's arable land. Indicate whether the statement is true or false