| A | B |
|---|
| FOLDED MOUNTAINS | created where two continental plates are pushed together EX: Mt. Everest |
| TRENCH | long and deep valley on the ocean floor created by subduction; ex: Mariana Trench |
| SUBDUCTION | process when one tectonic plate moves under another tectonic plate |
| DIVERGENT BOUNDARY | when two tectonic plates move away from each other |
| MID OCEAN RIDGE | an underwater mountain range created by diverging tectonic plates |
| RIFT VALLEY | A deep valley that forms where two continental plates move apart |
| TRANSFORM BOUNDARY | boundary where two tectonic plates shear past each other |
| SHEARING | process where plates slide past each other |
| FAULT | a break in the Earth's crust caused by shearing; San Andreas |
| CONVECTION CURRENTS | Circular currents in the mantle that causes oceanic & continental plates to move. |
| SEAFLOOR SPREADING | The process that creates new sea floor as plates move away from each other at the mid-ocean ridges |
| OCEANIC-CONTINENTAL CONVERGENCE | boundary where the more dense oceanic plate subducts under the less dense continental plate creating trenches or volcanic mountains |
| CONTINENTAL-CONTINENTAL CONVERGENCE | boundary where two continental plates collide creating folded mountains |
| OCEANIC-OCEANIC CONVERGENCE | boundary where denser plate is sub-ducted, deep trenches or volcanic islands formed |
| FOLDING | Process caused by compression of rock to form a mountain |
| PLATE BOUNDARY TYPES | divergent, convergent, transform |
| DIVERGENT BOUNDARY | boundary along which volcanoes form |
| TRANSFORM BOUNDARY | boundary along which earthquakes occur |
| MID-OCEAN RIDGE | long underwater volcanic mountain chain created when plates move apart |
| SUBDUCTION ZONE | the area of the asthenosphere where the plates melt |
| PACIFIC RING OF FIRE | a line of volcanoes that occurs along where the pacific plate is being subducted underneath other plates |
| DIVERGENT BOUNDARY | where new ocean crust is formed? |
| CONVERGENT BOUNDARY | Where old ocean crust is destroyed? |
| FOCUS | the place inside the earth where an earthquake starts |
| EPICENTER | the place on the earth's crust directly above the place where and earthquake starts |
| SEISOMOGRAPH | record of the movements of the earth's crust |
| PRIMARY (P) WAVES | travel through gases, liquids and solids push-pull waves fastest waves used to find the epicenter used to find travel time |
| SECONDARY (S) WAVES | travel through solids used to find the epicenter used to find travel time |
| SURFACE WAVES | travel through solids slowest waves cause the most damage |
| VISCOSITY | ability of a fluid to resist flowing |
| TEPHRA | all pieces of all fragments of rock ejected into the air by an erupting volcano |
| BASALTIC MAGMA | low viscosity |
| VISCOSITY | controls the character of eruptions--when higher lavas flow more slowly covering smaller area--when lower lava flows are more rapid and cover larger area |
| PYROCLASTIC FLOW | a dense, destructive mass of very hot ash, lava fragments, and gases ejected explosively from a volcano and typically flowing downslope at great speed. |
| TEPHRA | volcanic bombs |
