Earth and Space Science- Final Exam, Chapter 17

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On an average clear night, the number of meteors that can be seen per hour is

5 to 10

The moon's diameter is about

1/4 that of the earth.

The dwarf planets have diameters of about

1000 km.

The time needed for the Apollo spacecraft to reach the moon was about

3 days.

The planet with the most mass is

Jupiter.

Comets

follow orbits around the sun.

A planet that consists largely of hydrogen and helium is

Jupiter.

The largest of the following planets is: A. Mars B. Jupiter C. Saturn D. Uranus

Jupiter.

Most asteroids lie in a belt between

Mars and Jupiter.

An astronaut would weigh least on the surface of

Mars.

The smallest of the following planets is: A. Mars B. Jupiter C. Saturn D. Uranus

Mars.

A planet with virtually no atmosphere is

Mercury.

The largest of Jupiter's satellites is about the size of

Mercury.

The length of the year is shortest on

Mercury.

The planet nearest to the sun is

Mercury.

The planet whose surface most resembles that of the moon is

Mercury.

A dense atmosphere of carbon dioxide is found on

Venus.

A planet that has phases like those of the moon is

Venus.

A planet with no known satellites is

Venus.

The planet closest to the earth in size and mass is

Venus.

The planet that appears brightest in the sky is

Venus.

The moon's surface is

about as irregular as the earth's surface.

The tail of a comet always points

away from the sun.

At new moon, the moon is

between the earth and the sun.

The rings of Saturn

consist of separate particles.

An eclipse of the moon occurs when the

earth passes directly between the sun and the moon.

Meteors occur in the night sky

every night, but with greater frequency during shower periods.

Eclipses of the moon occur at

full moon.

The moon's surface shows no signs of

glacier erosion.

Comets consist largely of

ice and dust

The moon's maria are

lava flows pulverized by meteoroid impacts.

The spacecraft that traveled to Mars did not find

living things.

Compared with the earth, Mars has a

lower average surface temperature.

The average density of the moon is

lower than that of the earth.

Meteoroids are

members of the solar system.

Most of the craters on the moon are probably the result of

meteoroid bombardment.

An asteroid 2 km or more across could cause a worldwide catastrophe. Such an asteroid is thought to collide with the earth an average of every

million years.

Eclipses of the sun occur at

new moon.

Relative to the oldest rocks that have been found on the earth, the oldest known lunar rocks are

older.

The planets shine because they

reflect sunlight.

The surface of Titan, Saturn's largest moon

shows signs of erosion by flowing liquid.

The asteroids probably consist largely of

silicate minerals.

The majority of meteoroids consist of

silicate minerals.

The interior of the moon is probably entirely or almost entirely

solid.

Relative to the time the moon takes to circle the earth, the period of its rotation on its axis is

the same.


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