The Variety Of Rocks

The Variety Of Rocks

You could say that rocks are one of the natural objects that are very familiar with human life even from ancient times. Even so, quite a lot of us don’t really understand the types of rocks that have existed so far. Rocks can be defined as groups or aggregates of minerals that have hardened or frozen. Rocks are also known as natural objects that are the main constituent of earth’s material.

According to some research by experts, it is known that the process of rock formation takes millions of years. The rock cycle begins with the formation of igneous rocks, weathering of igneous rocks, rock movement, sedimentation, metamorphosis and melting of magma again. In grouping rocks are distinguished based on mineral and chemical composition with the texture of the particles and the process of their formation.

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Sedimentary Rock

Sedimentary rock is a type of rock that forms above the earth’s surface and occurs in the freezing process at low air pressure temperatures. These rocks are pre-existing rocks and are exposed to various types of weathering, in which the results of the weathering and erosion processes settle in the basin and become one. Over time this collection of sediments becomes a new stone. There are several types of sedimentary rocks such as conglomerate, sandstone, shale, limestone, breccia, clay and stalactites and stalagmites.

Frozen Rock

Igneous rock is rock that is formed because the process of its formation occurs from magma that has undergone cooling or freezing. Usually these rocks are in the mantle or crust. Until now there have been at least 700 types of igneous rocks identified. The process of formation of igneous rocks is divided into three kinds, namely as follows:


Intrusive igneous rock is one of the igneous rocks which in the process of its formation occurs inside or below the earth’s surface. This rock is a form of freezing magma in the earth’s crust, so it has a rough shape and texture.

Metamorphic Rock
Metamorphic or metamorphic rock is a type of rock that originates from sedimentary and igneous rocks. These rocks are the result of the transformation of a pre-existing rock type, or commonly known as metamorphosis.This rock formation process comes from pre-existing rocks, namely protolith. These rocks will experience considerable chemical or physical changes. This is because the protolith or rock of origin will be subjected to heat of more than 150 degrees Celsius.Metamorphic rocks also have various types. The following is an explanation of some of these types of metamorphic rocks:

1. Contact Metamorphic RockMetamorphic rock is a type of rock that undergoes a metamorphic process due to very high temperatures. This temperature comes from magma activity which causes changes in the shape and color of the rocks.Some examples of this metamorphic rock are marble, batholith, laccolite, and sill rock.

2. Regional Metamorphic RocksRegional metamorphic rocks are a collection of metamorphic rocks that are quite large and wide in size. Most of the rocks under the earth’s crust are metamorphic rocks that undergo metamorphosis when the continental plates collide.

3. Catalakstic Metamorphic RocksThis rock occurs due to the process of mechanical deformation mechanisms. So, when there are two plates that rub against each other, it will produce very high heat. Well, the part that is still experiencing friction will experience a structural change in it.

4. Overlapping Metamorphic RocksAs the name implies, this overlapping metamorphic rock is the result of rock being buried at great depths until it reaches a very drastic temperature change.These rocks can turn into regional metamorphic rocks if there are continuous changes in temperature and pressure.

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