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Two plates come together at what boundary?
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Two plates spread apart at what boundary?
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Plate Boundaries
| Question | Answer |
|---|---|
| Two plates come together at what boundary? | Convergent |
| Two plates spread apart at what boundary? | Divergent |
| Two plates slide past each other at what boundary? | Transform |
| New oceanic crust (sea floor) is created at this boundary. | Divergent Oceanic |
| Oceanic crust (sea floor) is destroyed at this boundary. | Convergent (except for Continental-Continental because crust is too buoyant) |
| The process where oceanic crust slides under another plate and is melted is called ___________. | subduction |
| What events/features occur near subduction zones? | Trenches, Volcanoes, and Earthquakes |
| A divergent boundary on land creates what feature? | Rift Valleys (ex. Great Rift Valley in Africa) |
| A divergent boundary in the ocean creates what feature? | Mid Ocean Ridges (ex. Mid-Atlantic Ridge) |
| When two continental plates converge (collide) what type of crustal feature is formed? | folded mountains (ex. Himalaya Mountain Range) |
| The process that occurs at a divergent oceanic boundary that creates new crust (sea floor) is called? | seafloor spreading |
| What is happening in the mantle that helps move the lithospheric plates? | convection currents |
| If an earthquake occurs at the bottom of the ocean floor what could form? | tsunami |
| Convergent boundaries involving oceanic crust always undergo subduction which creates what two crustal features? | trenches and volcanoes |
| What is the only event associated with transform boundaries? | earthquakes (ex. San Andreas Fault) |
| What is the only event associated with ALL plate boundaries? | earthquakes |
| True or False: Trenches are formed at Divergent oceanic boundaires | False (Mid ocean ridges are formed at divergent oceanic boundaries from the pressure of the magma uplifting the crust.) |
| True or False: Divergent boundaries are where subduction zones occur. | False (Subduction zones occur at convergent boundaries involving oceanic crust) |
| The two types of the Earth's crust are __________ and ___________. | Oceanic and Continental |
| The difference between oceanic crust and continental crust is... | Oceanic crust is mostly made of Basalt (more dense) and Continental crust is mostly made of Granite (less dense) |
| Harry Hess helped discover what theory? | Seafloor Spreading |
| Alfred Wegener discovered what theory? | Continental Drift |
| What two theories largely contributed to Plate Tectonic Theory? | Seafloor Spreading (Hess) and Continental Drift (Wegener) |
| Tsunamis are formed from what two types of convergent boundaries? | oceanic-oceanic and oceanic-continental |
| Why doesn't subduction occur at continental-continental convergent boundaries? | Because continental crust is too buoyant to be subducted into the mantle. (The plated fold up to create folded mountains instead.) |
Created by:
fordi85
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