The Planets: Question Preview (ID: 73)

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The radius of the Earth is approximately
a) 6,370 km
b) 637 km
c) 637,000 km
d) 63,700 km

Three planets known as gas giants because of their large size and low density are
a) Jupiter, Saturn, and Uranus
b) Venus, Uranus, and Jupiter
c) Jupiter, Saturn, and Venus
d) Venus, Neptune, and Jupiter

The average temperature of the planets
a) decreases with greater distance from the Sun
b) increases with greater distance from the Sun
c) has no relationship to the distance from the Sun
d) depends only on the chemical composition of the atmosphere of each planet

Why are impact structures (craters) more common on the surface of Mars than on the surfaces of Venus, Earth, and Jupiter?
a) The thin atmosphere of Mars offers little protection against falling rock fragments from space.
b) Mars has a strong magnetic hold that attracts iron-containing rock fragments from space.
c) The tiny moons of Mars are breaking into pieces and showering its surface with rock fragments.
d) Mars has the greatest surface area and receives more impacts.

Which planet has vast amounts of liquid water at its surface?
a) Earth
b) Jupiter
c) Mars
d) Venus

Which planet's day is longer than its year?
a) Venus
b) Mercury
c) Mars
d) Jupiter

Compared to the distances between the planets of our solar system, the distances between stars are usually
a) much greater
b) much less
c) about the same
d) none of the above

The Earth is slightly flattened from a perfect spherical shape because of
a) its rotation
b) the pull of the sun and moon
c) storms on the sun's surface
d) its molten core

Which of the following is not a characteristic of the Jovian planets?
a) they have low average density.
b) they have orbits outside the asteroids.
c) their composition lacks hydrogen.
d) they have large diameters.

The shape of the orbits of most of the planets in the solar system would best be described as
a) nearly circular
b) perfectly circular
c) parabolic
d) elliptical and very elongated

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