MASTERY CHECK: Earth Facts/Structure & Earth Systems

How long does it take for Earth to complete ONE ORBIT around the Sun?

• 24 hours

• 364 days
• 48 hours

• 365 days

Which imaginary line circles Earth at its widest point?

• Equator
• Prime Meridian
• Tropic of Cancer
• International Date Line

What are the 2 most abundant gases in Earth's atmosphere?

• carbon dioxide and oxygen
• carbon dioxide and nitrogen
• nitrogen and oxygen
• nitrogen and hydrogen 

How much of Earth's surface is covered by oceans?

• 80 %

• 70 %

• 50 %

• 90 %

What is the primary role of the moon in relation to Earth?

• Providing light at night

• Regulate the climate
• Keeping Earth steady

• Cause eclipses

What is the position of Earth in relation to the Sun within the solar system?

• Fifth

• Eighth

• Third

• First

What causes day and night on Earth?

• The phases of the moon
• The Earth's distance from the sun
• The rotation of the Earth on its axis
• The movement of the clouds

Which planet is mentioned as the fifth largest in the solar system?

• Earth

• Uranus
• Saturn
• Jupiter

The most dense layer of the Earth is:

• Crust

• Mantle

• Core

• Atmosphere

Which layer of the Earth is the hottest?

• Crust

• Mantle

• Inner Core

• Outer Core