6. The region in which one plate moves under another is C. magma chamber 5. suo cuccon zone D. vent Les the motion of gas or liquid caused by differences in temperature is a C. convection current tectonic movement . piate tectonic D. magma chamber Serving force for plate notion at mid-ocean ridges as a result of the rigid thosphere sliding down 5. slab pul C. convection current 3. edge push D. seafloor spreading 9. The process of one plate moving under another plate is called C. seafloor spreading 3. plate tectonics D. subduction mov man furt 10. Tectonic plates ride on inner core B. asthenosphere C. outer core D. lithosphere II. The region where old crust melted back into magma is 2. along plate boundaries C. at deep-sea trenches B. at the mid-ocean ridge D. volcano D or 12. Which of the following is NOT a method of heat transfer? £. condensation C. conduction B. convection D. radiation ar re et 13. The plastic-like upper portion of the mantle is called A the magra C. the lithosphere B the core D. the asthenosphere S id 14. Which of the following is NOT a driving force of tectonic plates? A ridge push C. drag force B. slab push D. mantle convection 15. What is the source of heat in a mantle convection current? C. the core A the Sun B. the crust D. the moon​