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Plate Tectonics
Important terms and ideas relating to Volcanoes, Earthquakes and Plate movement
| Term | Definition |
|---|---|
| Seismograph | The instrument used to measure the force of an earthquake |
| Tsunami | Giant tidal wave caused by an earthquake or volcanic eruption underwater |
| Convection Currents | Causes the movement of plates |
| Crust | Consists of about 15 plates and is like the skin of the earth |
| Continental Drift | The movement of plates |
| Fold Mountains | Found where plates collide |
| Focus | Center of earthquake beneath the surface |
| Epicentre | Point at which earthquake is felt the strongest on the earths surface |
| Fault Lines | The point where two plates meet |
| Earthquake | A series of seismic waves or tremors in the earth's crust |
| Aftershocks | Tremors that occur in the hours or days after the original earthquake |
| Richter Scale | This is used to describe the force of the earthquake |
| Mantle | Area where magma is stored and is 4000'C |
| Core | Center of the earth that consists of hot metals |
| Volcano | Caused when two of the earth's plates separate |
| Lava | What magma is called when it reaches the earth's surface |
| Active | A volcano that erupts frequently |
| Dormant | A volcano that has not erupted in a long time, but could possibly still erupt |
| Extinct | a volcano that has not erupted in historic times |
| Caldera | Formed when ground collapses after a volcanic eruption |