Geology

2. processes - processes that deform Earth's crust to create major structural features, such as mountains, continents, and ocean basins
5. island ar - a chain of volcanic island: generally located a fewVOLCANIC hundred km from a trench where there is active OCEANIC CRUST of one oceanic plate beneath another
6. ridge system - elevated areas of the seafloor characterized by high heat flow and volcanism.
8. drift - a hypothesis which suggested that all present continents once existed as a single supercontinent. Further, beginning about 200 million years ago
10. plate boundary - a boundary in which two plates slide past one another without creating or destroying lithosphere

1. trench - a narrow, elongated depression of the seafloor
3. ridges- elevated areas of the seafloor characterized by high heat flow and volcanism.
4. plate boundary a boundary in which two plates move apart, resulting in upwelling of material from the mantle to create new seafloor
7. spreading - a hypothesis, first proposed in the 1960s by Harry Hess, which suggested that new oceanic crust is produced at the crests of mid-ocean ridges, which are the sites of divergence
9. plate boundary - boundary in which two plate move together, resulting in oceanic lithosphere being thrust beneath an overriding plate, eventually to be reabsorbed into the mantle.