(a) Give the difference between: [6]
(i) Acidic igneous rock and Basic igneous rock
(ii) Calcareous rocks and Carbonaceous rocks
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Acidic' igneous rocks are rocks which are relatively high in silica and relatively low in iron and magnesium. 'Basic' igneous rocks are relatively low in silica and high in iron and magnesium. ... 'Acidic' igneous rocks are rocks which are relatively high in silica and relatively low in iron and magnesium.
Calcareous rocks are formed by skeletons, shells and animal remains. They contain large proportions of lime. Rocks like Peat, Lignite, Bituminous and anthracite are termed as carbonaceous rocks. They are formed due to precipitation of carbonate materials.
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