In addition to possibly releasing harmful chemicals in the environment, mining is considered
a. the most dangerous job in united states.
b. the least dangerous job in united states.
c. the least lucrative job in the united states.
d. the most lucrative job in the united states.

   Your answer would be B. The most dangerous job in the United States. Because the cave can come down, if you don't have the right equipment you can damage your lungs, and you may get stuck down there, or really hurt.

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.