| A | B |
|---|
| sea floor spreading | the tectonic process that takes place along mid ocean ridges |
| fault | the breaking and sliding surface between blocks of crust |
| mesosphere | strong, lower part of the mantle |
| convergent | boundary where two tectonic plates collide |
| core | layer of the earth made of iron |
| folding | term that describes the bending of rock due to stress |
| inner core | solid, dense center of the earth |
| divergent | boundary where two tectonic plates move away from one another |
| reverse | type of fault when the hanging wall moves up relative to the footwall because of compression |
| asthenosphere | putty like layer of rock that moves the tectonic plates |
| compression | type of stress that occurs when plates collide |
| lithosphere | layer of the earth made up of tectonic plates |
| subduction zone | a region where oceanic plates sink down into the mantle |
| outer core | liquid layer of the Earth's core |
| normal | fault that occurs when the hanging wall moves down relative to the footwall because of tension |
| mantle | layer of the earth that makes up most of the Earth's mass |
| strike slip | fault produced when opposing forces cause rock to break and move horizontally |
| Pangaea | ancient supercontinent that contained all landmasses |
| Alfred Wegener | first thought of the idea of continental drift |
| tension | type of stress created as plates move away from one another |
| Harry Hess | discovered that the sea floor was spreading, explaining how the plates move |
| transform | boundary created as plates slide past one another horizontally |
| rift valley | forms when a divergent boundary is located on a continent |
| Folded | mountains are formed as stress compresses rock layers together and pushes them upwards. |
| Fault Block | mountain is created when faulting causes large blocks of the Earth’s crust to drop down relative to other blocks. |
| Volcanic | mountains are formed as molten rock erupts onto the Earth’s surface near subduction zones |
