Solar System

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

One kind of  _______ is the crescent Moon.  

• axis
• asteroid
• phase
• space probe

One full orbit of an object around another object is called a ________.

• axis
• rotation
• revolution
• satellite

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

Why does Earth have different seasons? 

• because of the distance between Earth and the sun 
• because of the speed of Earth as it rotates on its axis 
• because of the amount of light blocked by the moon on its axis 
• because of the tilt of Earth on its axis as it moves around the sun 

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

• revolution
• orbit
• rotation

Which is the largest object in our solar system?

• Sun
• Jupiter
• Earth
• Pluto

Which planet is closest to the sun?

• Uranus
• Mercury
• Neptune
• Earth