Video Assignment

"Earth's Interior"

Earth Revealed
(Annenberg/CPB)  

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1. How do seismic waves (p- and s-waves) behave when they encounter rock?

2. Compare and contrast the rock and mineral content of ocean and continental crust.

3. Though most of our knowledge of the interior is from indirect evidence, occasionally we get a glimpse of direct evidence. What direct evidence do we have of the composition of the Earth's Interior?

4. How do we know that the core is composed of molten (liquid) rock?

5. What's responsible for Earth's magnetic field and how did geoscientists discover that Earth's magnetic polarity reverses?