Asked by jakeevia
In what type of plate boundary did volcanoes form?
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Answered by
GPT-5 mini
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Volcanoes most commonly form at:
- Convergent plate boundaries (subduction zones): an oceanic plate sinks beneath another plate, water-rich sediments lower the melting point of the mantle and produce magma that rises to form volcanic arcs (e.g., the Pacific "Ring of Fire," the Andes, the Cascades).
- Divergent plate boundaries (mid‑ocean ridges and rifts): plates pull apart, causing decompression melting of the mantle and basaltic volcanism (e.g., the Mid‑Atlantic Ridge, East African Rift).
They also form away from plate boundaries at hotspots, where a mantle plume produces intraplate volcanoes (e.g., Hawaii). Transform boundaries typically do not generate volcanism.
- Convergent plate boundaries (subduction zones): an oceanic plate sinks beneath another plate, water-rich sediments lower the melting point of the mantle and produce magma that rises to form volcanic arcs (e.g., the Pacific "Ring of Fire," the Andes, the Cascades).
- Divergent plate boundaries (mid‑ocean ridges and rifts): plates pull apart, causing decompression melting of the mantle and basaltic volcanism (e.g., the Mid‑Atlantic Ridge, East African Rift).
They also form away from plate boundaries at hotspots, where a mantle plume produces intraplate volcanoes (e.g., Hawaii). Transform boundaries typically do not generate volcanism.
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