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

• gas
• metal
• water
• rock

The moon is a natural  ______ of Earth.

• comet
• axis
• satellite
• space probe

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

• rotation
• revolution
• phase
• comet

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

• solar system
• earth
• rotation
• United States

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 outer planets have rings, and the inner planets don't

Which outer planets have rings?

• Just Saturn
• Saturn and Jupiter
• Jupiter, Neptune, and Saturn
• all 4 of them

Which is the largest object in our solar system?

• Sun
• Jupiter
• Earth
• Pluto

Which planet is closest to the sun?

• Uranus
• Mercury
• Neptune
• Earth

Which planet is third from the sun?

• Mars
• Pluto
• Venus
• Earth

Which planet is fifth from the sun?

• Saturn
• Jupiter
• Mars
• Earth