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Describe what features form when an ocean plate subducts underneath another ocean plate.
volcanic island arc
Describe what features form when an ocean plate subducts underneath a continental plate.
volcanic mountain range
Describe what features form when a continental plate subducts underneath another continental plate.
Rock closest to the mid-ocean ridge are (new, old), while the rocks furthest from the mid-ocean ridge are (new, old).
At a subduction boundary, what causes one plate to sink underneath another?
density; the denser plate sinks
What is the evidence for the theory of plate tectonics?
locations of earthquakes & volcanoes, as well as magnetic reversals
List 3 pieces of evidence that support the Continental Drift Theory.
shape or coastal formations; where rivers empty; plant growth
after earthquake; 100's can happen after an earthquake; cause damage; lower in magnitude than the original earthquake
What kind of data do scientist use to determine the location of seismic gaps?
location of past foci (foci is plural for focus)
Describe the movement and size of a tsunami as it approaches the shore.
speed decreases and the height increases
What events would indicate the possibility of a volcanic eruption?
earthquakes, uplifting, calderas, gas emissions
What 3 things must be present/occur in order for magma to form?
temperature, pressure, and water content
List the 3 types of volcanoes from least explosive to most explosive.
least explosive = shield, then cinder cone, then composite = most explosive
On which plate, the sinking one or the overriding plate, would a volcano form at a subduction boundary?
the overriding plate
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