Use the section on the Earth to answer the following questions.

1. How long does it take the Earth to revolve around the Sun? ____________________


2. How far is the Earth from the Sun?_______________________


3. Is the Earth's orbit around the Sun highly elliptical or almost circular?_______________________


4. The Earth is the densest planet in the Solar System. Is it denser or less dense than water?_______________________


5. It the Earth's rotation slowing down or speeding up slightly over time? _____________________


6. What is the core of the Earth made of? _______________________


7. What is the major component of the Earth's atmosphere? ______________________


8. What is the name of the lowest layer of the Earth's atmosphere? This is the layer in which weather occurs. _______________________


9. Are the seasons on Earth caused by the tilt of the Earth's axis or the fact that the Earth's distance from the Sun varies throughout the year? ______________________


10. Is the Earth double, four times, or eight times larger (in diameter) than the Moon? ______________________