Chapter 9 Review

Alfred Wegener proposed the _ continental drift plate tectonics ridge push seafloor spreading Ocean crust is made from submerged continents magnetically produced crust produced at the mid-ocean ridge produced at all plate boundaries What technologies did scienctists NOT use to develop the theory of seafloor spreading ? echo-sounding measurements GPS magnetometer measurements seafloor thickness measurements Mid-ocean ridges are usually associated with convergent plate boundaries divergent plate boundaries hot spots transform plate boundaries Which of Earth's outermost layers includes the crust and the upper mantle? asthenosphere lithosphere mantle outer core