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hotspots and magnetic reversals. Pacific Ring of Fire. Volcanism is mostly focused at plate margins. Volcanoes are formed by:. - Subduction - Rifting - Hotspots. Pacific Ring of Fire. Hotspot volcanoes. What are Hotspot Volcanoes?. - PowerPoint PPT Presentation
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hotspots and magnetic reversals
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Volcanism is mostly focused at plate margins
Pacific Ring of Fire
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- Subduction - Rifting - HotspotsVolcanoes are formed by:
+Pacific Ring of Fire
Hotspot volcanoes
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Hot mantle plumes breaching the surface in the middle of a tectonic plate
What are Hotspot Volcanoes?
Photo: Tom Pfeiffer / www.volcanodiscovery.com
The Hawaiian island chain are examples of hotspot volcanoes.
+The tectonic plate moves over a fixed hotspot forming a chain of volcanoes.
The volcanoes get younger from one end to the other.
+Magnetic Reversals
- The changing in direction of the Earth’s magnetic poles.
- When the Earth’s poles do change direction, the rocks on the seafloor become magnetically charged in the opposite direction
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