SEM - Lessons 1-4

Earth's rotation takes about how long?

• 365 days

• 6 months

• 24 hours

• 1 month

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

One complete revolution of Earth around the sun takes about...

• one rotation

• one season

• one year

• one eclipse

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

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

The phases 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

Galileo saw that much of the moon's surface is covered with round pits called...

• highlands

• seas

• craters

• maria

How large is the moon compared to Earth?

• about the same diameter as Earth

• about one-half the diameter of Earth

• about one-fourth the diameter of Earth

• about one-eighth the diameter of Earth

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 the space

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

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

In the Southern Hemisphere, the summer solstice occurs when the sun is...

• at the equator

• farthest south

• farthest north

• closest to the Earth