Unit 4 Review

In which direction does Earth's gravity pull?

• toward the sun

• toward Earth's center

• toward the North Pole

• toward the tallest mountain

The sun's gravity is _____________ Earth's because the sun is bigger than Earth.

• stronger than

• weaker than

The moon's gravity is weaker than Earth's. If you went to the moon, you would _____________________.

• shrink and become shorter

• weigh less than you do on Earth

• float off into space

• not jump as high as you do on Earth

The intense ___________ at the core of a star causes it to make light.

• sound

• heat

• cold

• gravity

Distances in space are so big, they are often measured in ___________________.

• light-years

• meters

• feet per second

• centimeters

The sun has the highest apparent brightness to Earth because it __________________.

• is larger than any other star

• is closer to Earth than any other star

• produces more light than other stars

• is hotter than other stars

Earth's axis is an imaginary line that ___________.

• goes around the equator

• extends from Earth to the Sun

• goes from the North Pole to the South Pole

The Sun rises in the ______.

• east

• north

• south

• west

What causes day and night?

• Earth moves closer to and farther away from the Sun

• Earth rotates on its axis

• the sun's light gets brighter and darker in a pattern

• the moon moves into and out of the sun's light

Which season has the fewest hours of daylight?

• fall

• spring

• winter

• summer