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Chemical Composition of Igneous Rocks

Igneous rocks make approximately 90% of the earth’s crust by volume. But their great abundance is hidden on the earth’s surface by a relatively thin layer of sedimentary and metamorphic rocks. Igneous rocks are formed by the cooling and solidification of magma. Magma is a hot viscous, siliceous melt containing water vapour and gases. It …

What are Igneous rocks? different types of Igneous Rocks.

There are three basic types of rocks. The igneous rocks, the metamorphic, and the sedimentary rocks. This classification has been made by earth scientists on the basis of their formation, properties, and composition. Read this classification in detail. Types of rocks. Igneous Rocks: The term igneous has been derived from the Latin word “Ignis”, which …