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Tectonic Plates Unit
Name the four different plate margins and know related vocabulary to volcanoes
| Question | Answer |
|---|---|
| -when 2 plates move away from each other and new crust is formed/constructed between the plates. Islands are often formed here. | Constructive Plate Boundary (divergent) |
| -when an oceanic plate is forced (subducts) under a continental plate. The oceanic plate is denser than the continental plate. Destructive earthquakes and volcanoes can occur here. | Destructive Plate Boundary (convergent) |
| -when 2 plates slide past each other. (i.e. San Andreas Fault) | Conservative Plate Boundary (transform) |
| -when 2 continental plates move toward each other and fold mountains can be formed. | Collison Plate Boundary |
| -the plates in the ocean | Oceanic Plates |
| -the plates on land | Continental Plates |
| -the amount of mass or weight of something. The Oceanic plate sinks under the Continental plate because it has more of this. | density |
| -to be drawn under | to subduct |
| -in a destructive plate boundary, the zone where the denser oceanic plate goes under the continental plate into the mantle. | subduction zone |
| - the portion of the earth between the crust and the core. | mantle |
| -a reservoir of magma in the earth's crust where the magma may reside temporarily on its way from the upper mantle to the earth's surface | magma chamber |
| -ability or tendency to float in water or other fluid (lighter molten rock has this in the mantle). | buoyancy |
| -weaknesses or cracks under the earth's surface where material is forced up because of gas pressure | fissures |
| -where 2 plates meet; where there is a greater distribution of volcanoes and earthquakes | plate boundaries |
| -the opening of a volcano | crater |
| -volcanoes with steep sides with layers of dust, ash and tephra; have high pressure and sticky lava. | composite cone |
| -volcanoes with a flatter profile and layers of solidified magma; have low gas pressure and runny lava. | shield |
| -most earthquakes and volcanoes occur/are distributed at plate boundaries. However, some like the African Rift occur away from plate boundaries. An exception like this is called an... | anomaly |
| the main pathway in the volcano where the lava comes up | primary vent |
| dust that comes out of the volcano | ash |
Created by:
tescommonstacks
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