There is one star in our solar system.

• True
• False

What is the difference between the inner planets and the outer planets?

• The outer planets are smaller than the inner planets 
• The inner planets are smaller than the outer planets
• The outer planets have more rocks than the inner planets
• the inner planets are heavier than  the outer planets

Venus is called Earth's twin because they are about the same size

• True 
• False

The gas giants are different from the terrestrial planets because they

• have smaller atmospheres
• are less dense
• have larger atmospheres
• are more colorful

The inner planets are called terrestrial planets because they are composed of

• water
• gas
• frozen surfaces
• rocks

One factor that makes life possible on Earth is

• an atmospher
• water
• greenhouse effect
• gravity

Which planet is tipped on its side nearly 90 degrees?

• Jupiter
• Saturn
• Uranus
• Neptune

Which planet has a giant red spot?

• Jupiter
• Saturn
• Uranus
• Neptune

Which planet has very prominent rings?

• Jupiter
• Saturn
• Uranus
• Neptune

Which planet is the hottest planet because of its clouds?

• Venus
• Earth
• Mars
• Pluto