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The magma inside the earth is very hot. This hot magma rises to form lava from volcanoes and intrusive ingneous formations on our landscape. Only about half of the heat that is needed for this processes is "leftover" or primordial heat from the formation of the Earth.

Which of the following statements explains the remaining energy that is producing the magma?

A

Radioactive decay of thorium and uranium produce heat when mass is converted to energy.

B

The core of the Earth is liquid because of the great pressure.
The molten rock is constantly in motion and this kinetic energy is transformed to heat energy at the interface to the mantle.

C

The asthenosphere is a highly viscous layer between the mantle and the lithosphere. As the Earth's plates slide along the lithosphere, intense friction is evident and creates the necessary heat to melt rock and create magma.

D

Lightweight elements exist in the center of the Earth. These are remnants from the formation of the earth and which have been trapped by the heavier rock layers. Under conditions of extreme pressure, fusion can take place and convert matter to energy with heat as a byproduct. This melts the magma.

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