Find the juan de fuca plate on the map in your text

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Convergent boundaries

Question 1: Find the Juan de Fuca plate on the map in your text. It is actually square shaped on its southwestern edge. This plate is bounded by all three plate boundary types. Just offshore of Washington state is the subduction zone. Which types of plate boundaries is this associated with?

Remember with many volcanic mountains, they are formed due to subduction. The slope of the subducting plate may be inclined steeply or gently. Research indicates that melting occurs at about 120 km in depth.

Notice how a subduction zone forms a triangle (similar to the image given in Blackboard). Knowing something about the depth at which melting occurs, measure on the map, using the scale of km, measure the distance from the trench to the volcano. Steepness of the subducting plate can be determined by comparing the distance measured to the depth. If they are the same (45° angle), then it's a steep angle. If the measured distance is shorter than the depth, it's very steep. If the measured distance is longer, then the angle is gentle.

Reference no: EM133260962

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