What is magma?
It is known that the temperature of the Earth inside is very high. Due to such high temperatures, magma is formed in the depths of our planet. What is magma? This is a hot, liquid melt that occurs in the crust or in the upper mantle. Magma consists mainly of molten rocks of silicate origin and reaches a temperature of 1200 ° C.
The mass of magma is less than the mass of rocks around it, therefore, periodically under pressure of rocks, magma erupts on the surface of the earth. It is so hot that it gradually begins to cool only at the top, and it cools unevenly. Some elements in the composition of the magma begin to harden faster than others, forming large crystals of matter. It is magma that consists of igneous rocks used in industry. Magma that has broken through faults out is called lava. It happens that the magma never breaks out, gradually cooling down and turning into a solid mountain mass. Often this process takes thousands of years.