That would be the Mississippi River<span />
1. Heat, Pressure, and Chemically active fluids
2. When the molten rock cools it forms igneous rock. Metamorphic rocks can form from either sedimentary or igneous rocks. The sedimentary particles from a sedimentary rock is formed can be originated from a metamorphic, an igneous, or sedimentary rock. All of these types of rocks can be melted to form a magma.
Hope this helps :)
Most work in mines. Central and west africa have some of the richest diamond, silver and iron mines in the world.
