As the old crust enters the mantle it brings volatiles such as water with it. This lowers the melting point of the rock around it.This melted material rises to the earths surface under pressure along with gases and may erupt in a volcano.
lithoshpere
Because earths crust is denser than the mantle
The mantle, being of a silly-putty-like consistancy, is responsible for the movement of the plates on earth's crust, or plate tectonics.
Tectonic Plates float on top of the earths mantle, the earths mantle is made up liquid which is always circulating.
mantle
How do changes in heat energy affect the density of earths mantle material
At convergent boundaries some mantle material can melt and rise through the crust, forming volcanoes.
The Mantle.
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The mantle =)
Convection
Convection
Valcano
When buoyant mantle material gets near Earth's surface, it can lead to the formation of volcanic hotspots. As the material rises, it can melt and contribute to the formation of magma chambers beneath the Earth's crust. This can result in volcanic eruptions and the creation of features like shield volcanoes or volcanic islands.
It is the Mantle.
As the old crust enters the mantle it brings volatiles such as water with it. This lowers the melting point of the rock around it.This melted material rises to the earths surface under pressure along with gases and may erupt in a volcano.