Which of the following is true of Mars?
A) It is about 95 percent of Earth's diameter.
B) It has a thick atmosphere rich in water vapor.
C) It is the smallest planet of the Solar System.
D) It has a heavily cratered crust marked by volcanoes.
Question 2Which of the following is true of Phobos?
A) It is bigger than Mars.
B) It is almost certainly a captured asteroid.
C) Its gravitational acceleration is equivalent to that of Earth.
D) Its atmosphere is completely made of nitrogen.
Question 3The Sun rotates with its equator inclined _____ to Earth's orbit.
A) 7.2
B) 14
C) 21.4
D) 28
Question 4One of the main causes of slow surface evolution is the:
A) depletion of ozone layer.
B) erosion due to moving air and water.
C) heat released from infalling matter.
D) heavy bombardment in the early Solar System.
Question 5Except Venus and Uranus, all the other planets:
A) rotate in the counterclockwise direction as seen from the north.
B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north.
C) revolve around the Sun in the clockwise direction as seen from the north.
D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.
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