EARTHSS 17 Lecture Notes - Lecture 4: Volcanic Arc, Continental Crust, Oceanic Basin

• School: UC-Irvine
• Department: Earth System Science
• Course: EARTHSS 17
• Professor: Elizabeth Crook

Document Summary

Course: earth science 17: divergent boundaries continental rifting. Divergent plate boundaries that develop within a continent. Pangaea broke up due to continental rifting. Begins as formation of an elongated depression called a continental rift. Ex: east african rift, basin and range province. The east african rift is an active rift. The red sea started as a rift, but it evolved into a narrow ocean basin; the rift axis became a mid-ocean ridge. C -- towards the edge: if each plate is moving at a rate of 2 cm per year, roughly how long did it take for rock c to reach its current location. They should match because the time it takes for a rock to reach a location is the age of the rock. Not all plates move at the same rate! *** hint this is a very good test question **: convergent boundaries -- plates that collide. What gets created at the spreading centers must get destroyed (subduction)