Rocks are things we often see in our lives, but in fact we don't know much about them. We might simply think that all stones are rocks, but that's not the case.

First, there are many ways to distinguish rocks. We can call naturally generated and naturally produced stones rocks, but the stones we create artificially cannot be called rocks, such as bricks and cement blocks that we often see in our daily life.

In fact, there is a more scientific method for the classification of rocks, which is to classify them according to their causes. This classification method can classify rocks into three categories, igneous rocks, sedimentary rocks, and metamorphic rocks.

1. Igneous rock

Igneous rocks are associated with fire when they hear their name. Igneous rocks are mainly formed by the cooling of magma under the earth's surface or by volcanic eruptions. But igneous rock will also form different types of igneous rock because of its cooling time, material and other reasons. The most well-known igneous rocks are granite, basalt and so on. Igneous rocks are formed at very high temperatures, generally between 700°C and 1500°C. And igneous rock occupies a major position in the entire crust. The 16km from the ground to the ground is basically composed of igneous rock, so it is also the main rock that composes the crust.

2. Sedimentary rocks

Sedimentary rocks, as the name suggests, can actually be roughly understood that sedimentary rocks are formed by the consolidation of sediments layer by layer. Sedimentary rock is one of the three major rock types, also known as sedimentary rock. It is a sedimentary layer formed in the process of crustal development and evolution, as well as the products of biological action and volcanism, in situ or transported by external forces, and formed by diagenesis. rock. On the earth's surface, 70% of the rocks are sedimentary rocks, but if the entire lithosphere from the earth's surface to a depth of 16 kilometers is calculated, sedimentary rocks only account for 5%. Sedimentary rocks mainly include limestone, sandstone, shale, etc. The minerals contained in sedimentary rocks account for 80% of the world's mineral reserves.

3. Metamorphic rock

Metamorphic rocks are rocks formed due to metamorphism. They are formed from magmatic rocks or sedimentary rocks first formed in the crust. Under the influence of changes in environmental conditions, the mineral composition, chemical composition and structural structure change.

Metamorphic rocks are probably of schist, slate and other types. Their common features are that on the one hand, there are the original characteristics of the original rock, and on the other hand, there are some changes in characteristics caused by changes in the internal structure of the rock caused by metamorphism. A long time ago, metamorphic rock was actually the most important formation in the formation. In many geological studies, it is found that there are distribution of metamorphic rocks in many fault zones in the original crustal movement.

Naturally produced rocks are essential substances that make up our entire earth. There is still a long way to go to study them. In modern life with the continuous advancement of science and technology, we will surely discover more and more secrets about rocks.