Understanding Earth

Which planet is the third from the Sun in our solar system?

• Earth

• Venus

• Mars

• Jupiter

How long does it take for Earth to orbit the Sun once?

• 24 hours

• 30 days

• 365 and one-quarter days

• 12 months

What causes the variation in Earth's distance from the Sun during the year?

• Sun's movement

• Moon's orbit

• Earth's rotation

• Earth's oval-shaped orbit

What are tectonic plates?

• Solid land masses

• Floating regions of Earth's surface

• Layers of the atmosphere

• Types of rocks

What percentage of Earth's surface is covered by saltwater oceans?

• 50%

• 60%

• 71%

• 80%

What is the primary component of Earth's atmosphere?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Hydrogen

How does Earth's atmosphere protect life?

• By blocking harmful space radiation

• By producing oxygen

• By providing food

• By creating mountains

Why is Earth referred to as the Goldilocks planet?

• It is too hot

• It is the largest planet

• It is too cold

• Conditions are just right for life

What would happen if Earth were closer to the Sun?

• It would have less gravity

• It would have more water

• It would be too hot

• It would be too cold

What is the distance of Earth from the Sun?

• 200 million miles

• 50 million miles

• 93 million miles

• 150 million miles