Geostrophic balance
A) is the balancing interaction of three forces.
B) helps explain the direction of winds over North America.
C) does not involve pressure gradient force.
D) only happens when frictional forces are significant.
E) all of the above
B
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The Himalayan Mountains resulted from an orogeny
a. True b. False
Calculate the annual degree days for Boston, Massachusetts using the following given monthly values.
One important reason we do not know much about the geologic history of the Precambrian is that ________
A) the climate was so harsh that erosion removed most of the rocks that formed during the Precambrian. B) rocks did not exist during much of that time C) radioactivity was not measurable during the Precambrian D) there are very few fossils preserved in Precambrian rocks E) we have not yet been able to establish the half-lives for radioactive elements that existed in the Precambrian
Which of the following describes how the funnel cloud characteristic of a tornado is principally formed?
A. Clouds are funnelled by downward air currents coming out of a cumulonimbus cloud. B. Dust and dirt is picked up from the atmosphere. C. Water vapour in the air is condensed and drawn into the low-pressure core of the tornado. D. Water is drawn up from the sea surface into the cloud.