ICSE BoardEnglish MediumSTD 9GeographyRocks2 Marks
Question
Describe how are igneous rocks formed? State their chief characteristics.
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Answer
Igneous rocks are formed by melting and cooling of magma originated from volcanic eruptions. These may be formed by diastrophism and volcanism. These rocks are strong, crystalline and dark in colour. These may be extrusive and intrusive on the surface and beneath the crust respectively.
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