A large rotating band of cloud extending downward from the base of a thunderstorm before a tornado forms is a ____ cloud
a. Mammatus
b. cumulonimbus
c. hook
d. mesocyclonic
e. wall
ANSWER: e
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Which of the following factors inhibits harmful algal blooms (HABs)?
Air can dilute and disperse significant amounts of pollutants.
Answer the following statement true (T) or false (F)
The black sand beaches in Hawaii are comprised of ________
A) ground up bottle and other debris placed there by Hawaii tourist bureaus. There is not natural sand in Hawaii because there is no quartz B) fragments of black coral C) fragments of obsidian glass D) fragments of basaltic volcanic rock
If the area shown in this figure is 240 kilometers wide, and the oldest crest is 4 million years old, what was the approximate rate of seafloor spreading across this ridge?
A. 960 kilometers per million years B. 2.4 kilometers per million years C. 60 kilometers per million years D. 240 kilometers per million years E. 0.24 kilometers per million years