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where is igneous rock found
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Igneous rock is found wherever molten rock (magma or lava) cools and solidifies. Common places include:
- At the Earth’s surface (extrusive igneous rocks): volcanic cones, lava flows, and fissures — e.g., basalt and rhyolite on volcanic islands, continental volcanoes, and flood-basalt provinces. Pillow basalts form where lava erupts onto the seafloor.
- Within the crust (intrusive/plutonic igneous rocks): large bodies like batholiths and plutons, plus dikes and sills — e.g., granite and gabbro exposed in mountain ranges after uplift and erosion.
- Tectonic settings where magma is produced:
- Divergent plate boundaries (mid‑ocean ridges and rift valleys) — mainly basalt.
- Convergent plate boundaries (subduction zones and volcanic arcs) — andesite, basalt, and rhyolite.
- Hotspots (mantle plumes) — volcanic islands like Hawaii (basalt) and large igneous provinces.
So igneous rocks occur on ocean floors, volcanic islands, mountain belts, continental interiors (as deep intrusions later exposed), and rift zones. Want examples for a particular country or region?
- At the Earth’s surface (extrusive igneous rocks): volcanic cones, lava flows, and fissures — e.g., basalt and rhyolite on volcanic islands, continental volcanoes, and flood-basalt provinces. Pillow basalts form where lava erupts onto the seafloor.
- Within the crust (intrusive/plutonic igneous rocks): large bodies like batholiths and plutons, plus dikes and sills — e.g., granite and gabbro exposed in mountain ranges after uplift and erosion.
- Tectonic settings where magma is produced:
- Divergent plate boundaries (mid‑ocean ridges and rift valleys) — mainly basalt.
- Convergent plate boundaries (subduction zones and volcanic arcs) — andesite, basalt, and rhyolite.
- Hotspots (mantle plumes) — volcanic islands like Hawaii (basalt) and large igneous provinces.
So igneous rocks occur on ocean floors, volcanic islands, mountain belts, continental interiors (as deep intrusions later exposed), and rift zones. Want examples for a particular country or region?
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