Unformatted text preview: rease.
grains Water H2O H2O The trapped water is released as the temperature increases,
… …causing the sedimentary rocks to melt
at lower temperatures. Thought questions for this chapter
If you were to drill a hole through the crust of a mid-ocean
ridge, what intrusive or extrusive igneous rocks might you
expect to encounter at or near the surface? What
intrusive or extrusive igneous rocks might you expect at
the base of the crust?
Look back at slide 26
Water is abundant in the sedimentary rocks and oceanic
crust of subduction zones. How would the water affect
melting in these zones?
It would decrease melting point
Why are granitic and andesitic rocks so plentiful?
It is a matter of the fact they exist primarily in continental
crust so we see them more often
crust Key terms and concepts
Extrusive igneous rock
Gabbro Key terms and concepts
Intermediate igneous rock
Intrusive igneous rock
Pumice Key terms and concepts
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- Summer '08
- Igneous rocks, Basalt