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Hotspot Ecosystem Research and Man's Impact On European Seas wikipedia , lookup
Earth's magnetic field wikipedia , lookup
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+ hotspots and magnetic reversals + Pacific Ring of Fire Volcanism is mostly focused at plate margins + Volcanoes are formed by: - Subduction - Rift valleys - Hotspots + subduction and collisions Subduction - When one crust sinks below another crust and melts, allowing magma to rise at the surface. Collisions – when mountians form when two plates collide into each other + Pacific Ring of Fire Hotspot volcanoes + What are Hotspot Volcanoes? *A hotspot is a location on the Earth's surface that has experienced active volcanism for a long period of time. *Hot mantle plumes are areas where magma collects and rises from the mantle to the surface inside tectonic plates. The Hawaiian island chain are examples of hotspot volcanoes. + *The tectonic plate moves over a fixed hotspot forming a chain of volcanoes. The youngest volcanoes are located on top of the hot spot and get older, the further out they are. + Magnetic Reversals Videos https://youtu.be/Ou1BiorYRNU https://youtu.be/igGsuDYxhEA + Magnetic Reversals Magnetic Reversal* - *Magnetic reversals are found in volcanic rock on the sea floor on either side of the mid ocean ridge. - *As the magma on the sea floor cools and hardens, it aligns in a pattern of magnetized stripes which holds records of reversals in the Earths magnetic field. - *The youngest rock records are located the closest to the mid ocean ridge + +