Basalt is a dense or foamy structure of rock that is solidified by the volcanic eruption of magma. It belongs to magmatic rock (also called igneous rock) in the geological rock classification. Magmatic rocks are divided into intrusive rocks and eruptive rocks. The intrusive rock is the underground magma that invades the upper part of the earth's crust under the action of internal force. The rock layer cools and solidifies to form rock. Its mineral crystal grains are larger, representing rock and granite. The ejected rock is the underground magma under the action of internal force, and the surface is condensed along the weak crust to form a rock. Its mineral crystal particles are small, and some have rhyolite or stomatal structure, which means the rock is basalt.
The magma temperature from the volcanic eruption is as high as 1200 degrees Celsius. Because of the certain viscosity, when the terrain is gentle, the magma flows very slowly, only a few meters away per minute; when it encounters a steep slope, the speed is greatly accelerated. It carries a lot of water vapor and bubbles during the flow, and after cooling, it forms various variograms.
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