Grade 7-Unit 5 Astronomy Exam

Day and night are caused by

• the tilt of Earth’s axis.

• Earth’s revolution around the sun.

• eclipses.

• Earth’s rotation on its axis.

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One complete revolution of Earth around the sun takes about

• one rotation.

• one season.

• one year.

• one eclipse.

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Earth has seasons because

• it rotates on its axis.

• the distance between Earth and the sun changes.

• its axis is tilted as it moves around the sun.

• the temperature of the sun changes.

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When the north end of Earth’s axis is tilted toward the sun, North America will experience

• more indirect rays and shorter days.

• more indirect rays and longer days.

• more direct rays and shorter days.

• more direct rays and longer days.

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The phase of the moon you see depends on

• where you are on Earth’s surface.

• how much of the sunlit side of the moon faces Earth.

• how much of the moon’s surface is lit by the sun.

• whether or not an eclipse is occurring.

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When are tides highest?

• during the moon’s first quarter phase

• when the sun, Earth, and the moon are nearly in a line

• during the moon’s third quarter phase

• when the moon is at a right angle to the sun

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Scientists think the moon was formed when

• a large object struck Earth, and ejected material from the collision combined.

• gravitational forces attracted a moon formed elsewhere in space.

• meteoroids collected and solidified within the pull of Earth’s gravity.

• gases from Earth escaped from the atmosphere and condensed in space.

Because the moon rotates once for each revolution around Earth,

• you see some phases more than others.

• a different side of the moon faces Earth each day.

• you never see the far side of the moon from Earth.

• the far side of the moon is visible only during the full moon phase.

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The amount of the lighted side of the moon you can see is the same during

• new moon and full moon phase.

• new moon and first quarter phase.

• first quarter and third quarter phase.

• full moon and third quarter phase.

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A light-year is

• 365 days.

• the distance light travels in a year.

• the distance from Earth to Proxima Centauri.

• the amount of light the sun produces in a year.