What are rocks?
A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter.*
It is generally made of chemicals composition. Rocks are found on the outer surface of the Earth. Different types of rocks have different types of classifications. Rocks are found almost everywhere. Different types of rocks are, there are three types of rocks:
Igneous Rocks –
Igneous rock is formed when magma or lava cools down and solidifies.
Igneous rocks are further divided into two main categories –
– Plutonic or intrusive rocks when magma or the lava cools and it crystallizes slowly and forms rock. Granites are an example of intrusive rocks.
– Volcanic or extrusive rocks are formed when magma reaches Earth’s surface either as lava or fragmental ejecta and forms minerals like pumice or basalt.
Sedimentary Rocks –
Sedimentary Rocks are deposition and subsequent collection of different types of materials and substances which are present in water, on the upper surface of the Earth. The process through which Sedimentary rocks are formed is called sedimentation. Sedimentary rocks are also formed through the deposition of air. They also contain fossils. There are 3 different types of Sedimentary rocks and they are: Clastic sedimentary rocks, chemical sedimentary rocks, and Organic sedimentary rocks. Examples of Sedimentary Rocks are limestone, sandstone, etc.
Metamorphic rock –
Metamorphic rock, any of a class of rocks that is formed from the modification of previous rocks because of changing ecological conditions, like varieties in temperature, pressure, and mechanical pressure, and the expansion or deduction of compound parts.
The word metamorphism is taken from the Greek for “change of structure”; metamorphic rocks are formed from volcanic or sedimentary rocks that have adjusted their structure (recrystallized) because of changes in their actual climate. Transformation contains changes both in mineralogy and in the texture of the first stone. All in all, these modifications are achieved either by the interruption of hot magma into cooler encompassing rocks (contact transformation) or by enormous scope structural developments of Earth’s lithospheric plates that change the pressing factor temperature states of the rocks.