What is the average diameter of the head of a comet?

a. ?1-2 km
b. ?less than 15 km
c. ?50 km
d. ?500 km
e. ?2,500 km


ANSWER: b

Environmental & Atmospheric Sciences

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Which of the following conditions is best suited to create an advection fog?

A) Vertically descending dry, cold air moving over a warm surface B) Vertically rising moist, warm air moving over a cold surface C) Laterally moving dry, cold air moving over a warm surface D) Laterally moving moist, warm air moving over a cold surface

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The average per capita world fish catch has increased significantly since 1972

Indicate whether the statement is true or false

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Using this nomogram, what is the magnitude of an earthquake that is 500 km from a seismic station and has an amplitude of 0.2 mm?

A. 4.0 B. 10.2 C. 2.0 D. 6.0 E. 7.0

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Which of the following is true with respect to Ravenstein's laws of migration?

A. International migration creates no counterflow of migration. B. Long-distance migration generally takes place in the form of moving from one large urban area to another. C. Women are more likely to migrate internationally. D. Step-by-step migration no longer takes place in today's world.

Environmental & Atmospheric Sciences