June 2015

Earthquakes and their causes

By |2017-01-17T11:22:16+02:00June 9th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Destruction wreaked by an earthquake. Image credit Telegraph.co.uk

Destruction wreaked by an earthquake. Image credit Telegraph.co.uk ZIMSEC O Level Geography Notes: Earthquakes and their causes
  • An earthquake is a shaking, vibration, trembling or movement in the earth’s crust.
  • They are caused by one tectonic plate sliding over or past another plate along […]

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Benefits and Problems of Volcanoes

By |2017-01-17T11:22:16+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Hot springs and geysers

By |2017-01-17T11:22:17+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Castle Geyser USA. Image credit Flyingfishphotography.com

Castle Geyser USA. Image credit Flyingfishphotography.com ZIMSEC O Level Geography Notes: Hot Springs and Geysers
  • Besides the major intrusive and extrusive landforms resulting from volcanic activity, other minor features of volcanoes include: hot springs, mud-pots, pools of boiling water, fumaroles and […]

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Lava Plateaus

By |2017-01-17T11:22:18+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Calderas

By |2017-01-17T11:22:19+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Extrusive volcanic landforms

By |2017-01-17T11:22:19+02:00June 7th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Pico Cão Grande in New Guinea. Image credit imgur.com

Pico Cão Grande in Gulf of Guinea. Image credit imgur.com ZIMSEC O Level Geography Notes: Extrusive volcanic landforms.
  • Magma sometimes reaches earth’s surface through a vent/hole or a fissure/crack in surface rocks.
  • When lava reaches and emerges onto the earth’s surface […]

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Landforms resulting from intrusive vulcanicity

By |2017-01-17T11:22:20+02:00June 6th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Some of the landforms resulting from intrusive vulcanicity. Image by Msneucleus.org

Some of the landforms resulting from intrusive vulcanicity. Image by Msnucleus.org ZIMSEC O Level Geography Notes: Landforms resulting form intrusive vulcanicity

Intrusive vulcanicity is the movement of gasses, magma and other materials into the earth’s curst to form interior volcanic […]


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Vulcanicity

By |2017-01-17T11:22:23+02:00June 6th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Violent volcanic eruption. Image by Dailymail.

Violent volcanic eruption. Image via Dailymail. ZIMSEC O Level Geography Notes: Vulcanicity
  • Vulcanicity refers to all the various way by which molten rock and gasses are forced into the earths and onto its surface.
  • It includes volcanic eruptions which lead to the formation of volcanoes, lava plateaus and geysers.
  • It […]

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Advantages of Rift Valleys and Block Mountains

By |2017-01-17T11:22:24+02:00June 6th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Yosemite Mountains and Valley. Image by Mountainprofessor.

Yosemite Mountains and Valley. Image by Mountainprofessor. ZIMSEC O Level Geography Notes: Advantages of Rift Valleys and Block Mountains

Advantages of block mountains

  • Relief rainfall is common raising the amount of annual precipitation within the vicinity of such mountains.
  • They have a cooler environments which invigorating tends to […]

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Landforms resulting from faulting

By |2017-01-17T11:22:25+02:00June 4th, 2015|Landform Studies, Notes, O Level Geography|

The Great African Rift Valley. Image by Mamonthsafaris.

The Great African Rift Valley. Image by Mamonthsafaris. ZIMSEC O Level Geography Notes: Landfroms resulting from faulting.

Major landforms that result from faulting include:

  1. Block Mountains
  2. Rift valleys
  3. Tilted blocks.

1. Block Mountains The formation of block-mountains (Horst). Image by WikiComons


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