The average thickness of the Earth's crust is about ________ miles
A) 70
B) 55
C) 34
D) 28
E) 17
Answer: D
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A fish propels itself through water mainly by
A. deflecting water downward. B. pushing water backward. C. wiggling its tail. D. pushing forward.
How has glacial ice aided the study of climate change?
A) Glacial ice contains trapped air bubbles that archive former atmospheric carbon dioxide concentrations. B) Glacial ice only exists where temperatures are exceedingly cold. C) Glacial ice flows only under its own weight, so studies of glacial ice reflect climatic conditions. D) Glacial ice stores water that would otherwise enter the oceans and cause sea level rise.
The Dust Bowl and the Great Depression brought many of what group immigrants to California?
A) Chinese B) African-American C) Okie D) Mexican
A black hole is
A. the result of the collapse of supergiant star. B. a region of space that is collapsed in on itself. C. likely found at the center of each spiral galaxy. D. all of the above