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ES 15 Telecourse

Video Questions

Unit 14

The following questions pertain to information contained in Video 14 "Intrusive Igneous Rocks" in the Earth Revealed Series. Please keep your answers as short and concise as possible.

1. Generally speaking how long does it take for magma to crystallize into solid rock?
2. What are intrusive igneous rocks?
3. How do igneous rocks form?
4. What are the sources of heat that help to form igneous rock?
5. What are extrusive igneous rocks?
6. What are mafic rocks?
7. What are felsic rocks?
8. Why do some igneous rocks lack visible crystals?
9. Why do some igneous rocks have visible crystals?
10. Where do granites form?
11. What is a phenocryst?
12. What type of activities are occurring at ocean ridges?
13. What is the most common rock on the ocean floor?
14. What are plutons?
15. Why does magma rise?
16. What is a dike?
17. What is a sill?
18. What is a laccolith?
19. What is the difference between phaneritic and aphanitic textures?
20. Most of the earth is comprised of what type of rock?

Video Questions

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