Chapter 27 Earth Moon Sun System

The phases of the moon are the regular changes in how the moon looks from Earth. In which phase is the moon not visible from Earth?

• waxing crescent

• waxing gibbous

• waning crescent

• new moon

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How long does it take Earth to complete one orbit around the sun?

• 60 days

• 1 day

• 27 days

• 365 1/4 days

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Why is the timing of tides predictable?

• because ocean water density is predictable

• because the moon's path is predictable

• because the sun's movements are predictable

• because winds are predictable

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Which statement best describes a neap tide?

• the difference in levels of ocean water at high tide and at low tide

• a tide of minimum range that takes place two times a month

• a rise in ocean water levels that takes place on the side of Earth nearest the moon

• the periodic rise and fall of the water level in the oceans

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The Northern Hemisphere receives more solar energy during one half of the year than it does during the other half of the year. Which of the following happens during the year to explain this?

• The angle that Earth is tilted on its axis changes.

• The distance of the Northern Hemisphere from the sun changes.

• The amount of energy that is produced by the sun changes.

• The angle at which sunlight reaches the Northern Hemisphere changes.

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Once a month, Earth passes directly between the moon and the sun. Is a solar eclipse possible during this time?

• Yes, because new moons happen when Earth is between the moon and the sun, and solar eclipses happen only during new moons.

• No, because new moons happen when Earth is between the moon and the sun, and solar eclipses happen only during full moons.

• Yes, because full moons happen when Earth is between the moon and the sun, and solar eclipses happen only during full moons.

• No, because full moons happen when Earth is between the moon and the sun, and solar eclipses happen only during new moons.

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Bonita observes the moon several times during the month of August. She sketches the appearance of the moon on four days—August 1, August 9, August 17, and August 24—and identifies each lunar phase. Bonita’s data is shown in the table below. On which date should Bonita expect the next new moon to take place?

• September 12

• August 31

• September 7

• September 22

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Just as Earth moves around the sun, the moon revolves around Earth. About how many Earth days does it take for the moon to travel around Earth?

• about 180 days

• about 365 days

• about 7 days

• about 28 days

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Which of these statements best describes tides?

• changes in water level that happen when Earth, the sun, and the moon form a straight line

• the periodic rise and fall of water levels in the oceans and other large bodies of water

• a water level lower than the average water level

• a water level higher than the average water level

Sometimes the moon looks like a crescent. At other times, the moon looks like a half circle. What makes it possible for you to see the surface of the moon from Earth?

• Light from Earth is reflected by the moon’s surface.

• The moon absorbs sunlight during the day and glows at night.

• The moon gives off its own light.

• Light from the sun is reflected by the moon’s surface.

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