spots is not related to plate motion we see a line of volcanoes because of

Spots is not related to plate motion we see a line of

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spots is not related to plate motion (we see a line of volcanoes because of plate motion, but there is not a plate boundary causing the mantle rocks to melt). Volcanoes are formed at divergent boundaries due to decompression melting and at convergent boundaries with subduction zones due to flux melting. The diagram below shows several volcanic islands formed by an ocean-ocean convergent plate boundary and the age of the youngest volcanic rock (Ma = millions of years ago). Use the diagram to answer the questions. 6. Which of these locations have active volcanoes? (HINT: look at the age of the volcanoes) A B C D 7. How many plates are in this diagram? (HINT: the trench is the boundary between the plates) ___ 8. Which arrow below bests shows the relative direction the plate with the islands is moving? (HINT: at a subduction zone, the plates are moving toward the trench) 9. You are a geologist studying some volcanic islands in the middle of the ocean. How do you know if the volcanoes are formed at a convergent boundary or at a hotspot? Give at least two observations that would be helpful to determine whether they were formed by a hotspot or a convergent plate boundary. 4 A B C D 0 – 1 Ma 0 – 1 Ma 0 – 1 Ma 0 – 1 Ma Trench Trench
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