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Summary Volcanism - Grade 11 IEB Geography R50,00   Add to cart
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Summary Volcanism - Grade 11 IEB Geography
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Detailed notes that summarise the Geography IEB syllabus of Volcanism. Included in these notes are important definitions and concepts to learn as well as diagrams that make the section more understandable.

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  • January 30, 2021
  • 4
  • 2019/2020
  • Summary

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Volcanis

Origi
• Molten rock inside the mantle is known as magma.
• This is extremely hot and under great pressure inside the mantle.
• Magma escapes to the surface at places where there are cracks or weaknesses
in the earth’s crust or along the boundaries.
• Magma either solidi es on or in the earth and forms igneous rock

Intrusive forms of Volcanis




• Intrusive bodies are formed when magma solidi es before it reaches the surface
• These features are exposed through erosion.
• When this occurs a dyke looks like a narrow ridge of different rock: a pipe forms a
conical hill and still forms the caprock of a mesa or a butte.
• Karoo is made up of dolerite.





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