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Changes in their constituent minerals may result in them changing into the other.Some of the latest technology and tools that we use today may trace their origins to more primitive rock-based tools used by our early ancestors.While studying the characteristics of these rocks, it is essential to be aware about the processes that are responsible for their formation.Igneous Rocks Igneous rocks are created when molten magma cools down. Plutonic or intrusive rocks come into being when magma cools and crystallizes gradually inside the earth's crust. Volcanic or extrusive rocks are formed when the magma reaches the surface either as lava or as fragmental ejectiles.These are mainly formed between the plutonic and volcanic rocks. The word igneous may be traced back to the Latin term 'Igneous' or fire. They vary from each other in terms of occurrence, texture, mineralogy, chemical composition, and geometry.
The former takes place when magma is injected into the surrounding solid rocks, whereas the latter is primarily associated with large masses of rock spread over a very wide area.
Igneous and sedimentary rocks mainly undergo this change and become metamorphic rocks.