Most of the minerals in the mantle are silicates meaning they contain silica.
Is most of the upper mantle made of granite.
Silica is found in the upper mantle but not granite.
Temperatures range from approximately 200 c 392 f at the upper boundary with the crust to approximately 900 c 1 650 f at.
Although most upper mantle rocks can be assumed to be peridotite mostly made of olivine and pyroxene other minerals including oxides and hydrates should be taken into account especially when they participate in transitions or chemical reactions that may affect the physical properties of the mantle rocks.
Much of upper mantle is thought to be made of granite.
Granite is found in the crust primarily conditnental crust as.
A glassy texture is the result of lava that has cooled very slowly.
It is liquid rock that keeps the earth s outermost layer the crust floating and moving across the surface of our world.
The cooler mantle material will there fore tend to sink while the hooter material will tend to rise.
Rapid cooling of magma or lava results in rocks with small interconnected mineral grains.