volcano Archives - Free ZIMSEC & Cambridge Revision Notes

Calderas

El Boqueron caldera in El Salvador. Image credit Wikispaces.com

El Boqueron caldera in El Salvador. Image credit Wikispaces.com ZIMSEC O Level Geography Notes: Calderas

Calderas are very large craters often two or more kilometers in diameter that form at the top of volcanoes.
They are often deep extending downwards for a few hundred […]
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Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup.

Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup. ZIMSEC O Level Geography Notes: Lava Plateaus

Lava eruptions through narrow cracks (fissures) tends to be very quiet and subdued.
The lava spreads out over the surrounding countryside.
Successive lava outpourings causes successive layers of lava to […]
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Castle Geyser USA. Image credit Flyingfishphotography.com

Castle Geyser USA. Image credit Flyingfishphotography.com ZIMSEC O Level Geography Notes: Hot Springs and Geysers

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Fertile volcanic soil Kenya. Image credit tishaferral.com

Fertile volcanic soil Kenya. Image credit tishaferral.com ZIMSEC O Level Geography Notes: Benefits and Problems of Volcanoes

Benefits of volcanoes to humans

They eject lava and ash which in turn produce very fertile soils which boost agriculture activities.
Volcanoes and areas near them can […]
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