Assume that the average rate of 1-km-sized asteroids hitting the Earth is about 1 every million years. The chance of the Earth being hit by a 1-km-sized asteroid in the next 100 years is about
A) one in 100 million.
B) one in ten thousand.
C) inevitable, it has to happen sometime.
D) zero.
E) one in a million.
B) one in ten thousand.
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What will be an ideal response?
Headward erosion of a group of cirques around a mountain may produce
A) glacial lakes. B) an arete. C) a horn. D) a hanging valley.
Based on the law of conservation of angular momentum, what would happen to a collapsing cloud of gas and dust--isolated in space with no external forces--as its size decreases?
Choose one: A. The cloud will gain mass. B. The cloud will spin more slowly. C. The cloud will lose mass. D. The cloud will not be able to collapse at all. E. The cloud will spin faster.
Why is it easier to travel to a remote viewing site with an 8" Cassegrain than an 8" Newtonian reflector?
What will be an ideal response?