Answer:
1. Volcanoes form when the oceanic plate goes under the continental plate into the Earths hot interior, which makes some of the rock melt and rise through the continental plate causing earthquakes and volcanoes.
2. Because in the Appalachian mountains there is an erosion that occurs naturally and the influence of human activity.
3. In transform boundaries 2 plates move against each other which creates tension, when the tension is released it creates a big jolt. In 16 million years, the plates will have moved so much that Los Angeles will be north of San Francisco
