The imaginary line running through the center of Earth.

• axis
• equator
• revolution
• orbit

The sun and everything that revolves around it.

• solar system
• galaxy
• universe
• rotation

The moon appears to change shape because of _____.

• the Moon's revolution around Earth
• the seasons of the year
• storms on the moon
• Earth's rotation on its axis

What is one cause of Earth's seasons?

• the tilt of Earth's axis
• Earth's rotation
• the revolution of the Moon
• Earth's distance from the Sun

The rotation of Earth on its axis causes the pattern of _____.

• night and day
• constellations
• Earth's seasons
• the phases of the moon

It takes Earth _________ to make one complete rotation on its axis.

• 24 hours
• 365 days
• 28 days
• 24 days

It takes Earth _____________ to make one revolution or orbit around the Sun.

• 365 days
• 365 hours
• 28 days
• 24 hours

When the moon appears to increase or get bigger.

• Waxing
• Waning

When the moon appears to decrease or get smaller

• waning
• waxing

How many planets are in our solar system?

• 1
• 8
• 9
• 11