B. shifts in the earth's magnetic field. C. convection in the asthenosphere. D. the weight of subducted plate pulling downward. Plate boundaries are located, in part, by the occurrence of linear belts of volcanoes and earthquakes. The Himalaya Mountains were formed by repeated volcanic eruptions over a zone of hot spots.
Continental shields are A. a type of volcano having calm eruptions of mafic lava.
B. a protective armor around the continents that keeps them from growing. C. the stable, interior parts of continents that is very old. D. the unstable fringe of the continents that has accreted onto the old part. Slow, gradual slip along a fault is termed A. stress. An earthquake's epicenter is A. the point of first break along the fault.