Which planet is the hottest?

• Mercury
  A
• Venus
  B
• Mars
  C

What part of the body stretches the most without gravity?

• Feet
  A
• Spine
  B
• Hands
  C

What mostly affects the color of an egg yolk?

• Type of chicken
  A
• Food it eats
  B
• Season
  C

Why is seawater salty?

• Fish live in it
  A
• Sun makes it stronger
  B
• Minerals wash in from land
  C

What causes a rainbow?

• Reflection
  A
• Refraction
  B
• Both
  C

How many times does the human heart beat in a day?

• About 10,000
  A
• About 50,000
  B
• About 100,000
  C

What produces most of Earth’s oxygen?

• Forests
  A
• Sea algae
  B
• Rain
  C

Where does sound travel the fastest?

• In air
  A
• In water
  B
• In solid
  C

What happens to tears in space?

• They float
  A
• They evaporate
  B
• They roll down your cheek
  C

Which is heavier: 1 liter of water or 1 liter of ice?

• Water
  A
• Ice
  B
• Same
  C