1. Other than location, what is the primary difference between Earth's core and Earth's crust? Explain.

2. Silicon is essential for the computer industry in making microchips. Can silicon be mined directly from Earth? Defend your answer.

3. What two minerals make up most sand in the world?

4. Is Earth's interior mostly magma? Explain.

5. Where on Earth's surface are lava flows most common?

6. What are the two processes by which rock is changed during metamorphism?

7. If the mid-Atlantic ocean is spreading at 2.5cm per year, how many years has it taken for it to reach its present width of about 5000km?

8. Compare the relative speeds of primary and secondary seismic waves. Which type of material can each travel through?

9. Even though the inner and outer cores are both composed of predominantly iron and nickel, the inner core is solid and the outer core is liquid. Why?

10. Where and what is the most likely source of the energy that generates Earth's magnetic field?