Mantle's Middle Class - Mantle

Mantle is located between the earth and the earth's core, within a depth of 33km - 2,900km, accounting for 83.3% of the Earth's volume. Because it is in the middle, it is also called the middle class.

(Photo: aps.anl)

Mantle also divided into upper and lower layers. The upper Mantle consists of silicon, oxygen, iron and magnesium, in which iron and magnesium are the most, much more than the outer shell. It is also known that this class is the magnesium iron Mantle and said that substances in Mantle are in a local melting state. It is like a conveyor belt, causing the earth's shell to move slowly, and causing substances in the upper and lower layers of the Earth to exchange with each other. This is also a source of lava. The mysterious stone is widely distributed in the soil cover that has been sprayed from this source. Mantle below the silicate out, metal oxides and vulcanizing substances increase markedly. Its density is greater than the upper Mantle, in the form of solids.

It is estimated that Mantle temperature is 1000-2000 degrees C. Pressure is 90 million - 0.382 million atm. Density up to 3.3 - 4.6g / cm ³ . In such an environment, matter is in a plastic state. Like asphalt, solid state only exists for a short time, so it will be deformed for a long time, can be molded. The upper mantle has a smaller pressure than the material in the unfinished molten form, called "pasty" . The soil is hard on the dewy layer. If a certain piece of earthshell is cracked, molten lava will follow the crack, forming an active volcano.

Mantle class is a vast underground world, humanity knows very little about it.