ICSE BoardEnglish MediumSTD 7GeographyTypes of Rocks3 Marks
Question
How do acidic igneous rocks differ from basic igneous rocks?
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Answer
Igneous rocks may also be classified as acidic or basic depending on their composition. The acidic rocks contain more than 65% silica and a very low percentage of oxides. These are Arundeep’s Self-Help to Voyage-7 less dense and light coloured. For example, granite. The basic rocks contain a low percentage of silica and a high percentage of oxides. These are dense and dark coloured. For example, basalt.
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