Unit 1: Earth, Moon, Sun Systems

The Earth's _?_ is an imaginary line that goes from the North Pole to the South Pole and that it rotates on.

• equator

• axis

• prime meridian

• equinox

The spinning of an object on its axis is called _?_.

• orbit
• rotation
• revolution
• tide

If the Earth rotated slower, what would be affected?

• there would be a longer day

• the would be a shorter day

• same time, 24 hours

• tides would stop

What are the reasons for the seasons?

• Earth's tilt and rotation on its axis.

• Earth's rotation and revolution.

• Earth's tilt as it revolves around the sun.

• Earth's tilt and resolution from the moon.

When the Northern Hemisphere of Earth is tilted toward the sun, what season is the Southern Hemisphere experiencing?

• Summer

• Winter

• Spring

• Fall

What causes the phases of Earth's moon to change over the course of a month?

• The moon's orbit (revolution)

• The moon's spin (rotation)

• The earth's orbit (revolution)

• The earth's spin (rotation)

Name this phase of the moon.

• waning crescent
• waxing crescent
• waning gibbous
• waxing gibbous

Which of the following causes the ocean’s tides?

• The Earth's spinning makes the oceans slosh like a bathtub.

• The Earth's gravity pulling on the moon.

• The sun and moon's gravity pulling on the Earth.

• The Sun's gravity pulling on the moon.

How long does it take for the Earth to rotate once?

• 24 hours
• 365 days
• 27.3 days
• 27.3 hours

Fall and Spring occur during __?__.

• solstices

• equinoxes

• New Moons

• Full Moons