Hotspots and magnetic reversals
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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?.

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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?

  • Hot mantle plumes breaching the surface in the middle of a tectonic plate

The Hawaiian island chain are examples of hotspot volcanoes.

Photo: Tom Pfeiffer / www.volcanodiscovery.com


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
Magnetic Reversals chain of volcanoes.

  • 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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