Chapter 19, 20, and 21 Review

The phases of the moon are the regular changes in how the moon looks from Earth. In which phase is the moon not visible from Earth?

• New Moon
• Waxing gibbous
• Waxing crescent
• Waning crescent

The Earth's tilt is _?_degrees.

• 0
• 90
• 23.5
• 41

The order of the planets is:

• Mars,Venus,Earth,
  Mercury,Saturn
  Jupiter, Uranus, Neptune
• Earth,Venus,Mars
  Jupiter, Neptune,
  Mercury,Saturn,
  Uranus
• Mercury,Venus,Earth
  Mars,Jupiter,
  Saturn,Uranus
  Neptune

Which planet is the largest?

• Jupiter
• Saturn
• Uranus
• Neptune

How many outer planets are there?

• 4
• 8
• 9
• 20

What planet has the biggest volcano?

• Mars
• Jupiter
• Earth
• Venus

Which is hotter: Venus or Mercury?

• Venus
• Mercury
• They are exactly the same.
• Sun

Which planet still has a great spot?

• Jupiter
• Neptune
• Mars
• The Moon

What is the sixth planet from the sun?

• Saturn
• Uranus
• Neptune
• Asteroid Belt

The outer planets have solid, rocky surfaces.

• True

• False