The On Volcanic Rocks Essay Example

Igneous rocks are found abundantly in the earth’s crust. Two processes lead to the formation of Igneous rocks. The first process results when the molten or liquid rock(magma) cools and crystallizes deep inside the earth thus forming the characteristic rocks. They can also be formed when the molten rock(lava) erupts from a volcano and hardens or crystallizes on the surface of the earth. These two processes lead to the formation of two separately characterized rocks from the same original substance. These variations include physical characteristics like the texture and the color which helps in identifying them. Grain size or texture is used to differentiate the two basic types of volcanic rocks. Texture reveals the size of the crystals and thus shows where the rock was formed. It explores the origin of the rocks.

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