A meteorite struck the Earth with tremendous velocity.
A meteorite collided with Mars.
Approximately 1,000 rocks were ejected from Mars.
The orbits of Earth and Mars brought the planets to their closest points.
Rocks from a meteorite impact broke free of Earths gravity.
19. The passage suggests that which of the following is true concerning the probability that a rock, if ejected from Mars, will hit the Earth?
The probability is increased when particles are ejected from Mars in random directions.
The probability is increased by the presence of large craters on the surface of Mars.
The probability is decreased when Marss orbit brings the planet close to Earth.
The probability is greater than the probability that a rock from Earth will hit Mars.
The probability is less than the probability that a rock from Earth will escape Earths gravity.
20. Which of the following, if true, would cast most doubt on Phinneys estimate of the probability of Earth rocks hitting Mars?
Rather than going in random directions, about 25 percent of all particles ejected from Earth go in the same direction into space.
Approximately 100 meteorites large enough to make a noticeable crater hit the Earth each year.
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