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Rocks — Geography STD 9 — Question

ICSE BoardEnglish MediumSTD 9GeographyRocks2 Marks
Question
Distinguish between the following : Acid Igneous Rocks and Basic Igneous Rocks.
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Answer

Acid Igneous Rocks Basic Igneous Rocks
These are lighter rocks with silica content $65$ to $85$ percent with density less than $2 g/Cm^3$ These are denser rocks with silica content $40$ to $60$ percent with average density between $2.8 g/Cm^3$ and $3.0 g/Cm^3$
e.g. Granite. e.g. Basalt.

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