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Trench suction Ridge push Flood basalts on uplift Figure 4.42 Mantle plumes rise
upward through the mantle. When the large head contacts a continent, it causes
uplift and the eruption of flood basalts. continental plates. In this scheme, plate ...
Ocean Oceanic crust Figure 4.44 Continental breakup caused by a mantle plume
. (A) A dome forms over a mantle plume rising beneath a continent. (B) Three
radial rifts develop due to outward radial flow from the top of the mantle plume.
Discuss possible driving mechanisms for plate tectonics. 18. Describe the various
types of plate boundaries and the geologic features associated with them. 19.
What is a mantle plume? What is the geologic significance of _ mantle plumes?
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Introduction to Physical Geology
Terms to Remember 382
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