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How do acidic igneous rocks differ from basic igneous rocks? - Geography

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How do acidic igneous rocks differ from basic igneous rocks?

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Solution

Igneous rocks may be classified as acidic or basic depending on their chemical composition.

  • Acidic igneous rocks contain more than 65% silica and a low percentage of oxides. They are light in colour and less dense.
    Example: Granite.
  • Basic igneous rocks contain a low percentage of silica and a high percentage of oxides (such as iron and magnesium). They are dark in colour and dense.
    Example: Basalt.
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Rock and it's Types
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Chapter 7: Types of Rocks - Answer the questions in one or two paragraphs

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Oxford University Press Voyage Geography [English] Class 7
Chapter 7 Types of Rocks
Answer the questions in one or two paragraphs | Q 4
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