medal offered

When rocks return to the Earth's mantle, they can eventually melt and become magma. _______ and _______ are the main factors that control this change.
Friction; cold
Erosion; weathering
Contraction; expansion
Pressure; heat

Question

medal offered

When rocks return to the Earth's mantle, they can eventually melt and become magma. _______ and _______ are the main factors that control this change.
Friction; cold
Erosion; weathering
Contraction; expansion
Pressure; heat

thomaster · Answer

i guess pressure and heat. Normally a rock wouldn't melt in the earth mantle but by increasing the pressure you lower the melting point so it melts :)

anonymous · Answer

pressure and heat

anonymous · Answer

It should be "pressure" and "heat".