01:460:103 Lecture Notes - Lecture 10: Convergent Boundary, Divergent Boundary, Mantle Plume

• School: Rutgers University
• Department: Geological Sciences
• Course: 01:460:103
• Professor: professor Feignson

Document Summary

A region of earth"s outer shell beneath the lithosphere. The asthenosphere is of indeterminate thickness and behaves plastically. continental drift. A concept suggesting that continents move over earth"s surface. convection. A very slow circulation of a substance driven by differences in temperature and density within that substance. convergent plate boundary. A boundary between two plates that are moving toward each other. divergent plate boundary. Boundary separating two plates moving away from each other. island arc. The rigid outer shell of earth, 70 to 125 or more kilometers thick. magmatic arc. Generally the line, as seen from above, is curved. mantle plume. Narrow column of hot mantle rock that rises and spreads radially outward. plate. A large, mobile slab of rock making up part of earth"s surface. plate tectonics. A theory that earth"s surface is divided into a few large, thick plates that are slowly moving and changing in size. Intense geologic activity occurs at the plate boundaries. polar wandering.