Earth and the other planets closest to the Sun are made mostly of _______

• gas
• metal
• water
• rock

Earth's ________ on its axis causes day and night.

• rotation
• revolution
• phase
• tilt

The moon is a natural  ______ of Earth.

• comet
• axis
• satellite
• space probe

The __________ has planets, moons, comets, and asteroids.

• solar system
• earth
• rotation
• United States

Day and night is caused by the _____________ of earth on its axis.

• revolution
• orbit
• rotation

Object spinning on its axis. 

• revolution
• rotation

Why do the planets revolve around the sun?

• The seasons cause it
• Rotation happens 
• Gravity holds them in an orbit

One of the main differences between the outer and inner planets is __________.

• The inner planets all have water
• the inner planets are much bigger than the outer planets
• the outer planets are gas planets
• the inner planets have rings, and the outer planets don't

As the Earth travels around the sun, this tilt causes different areas of the Earth’s surface to get different amounts of daylight at different times of the year. The angle of the Sun’s rays to the surface also causes areas to have more or less of the Sun’s energy. This causes the ________.

• months
• day and night
• seasons
• years

Which of the following causes seasons?

• the earths tilt and revolution
• the earths rotation
• the earths revolution around the sun
• the closeness of earth to the sun