Diamonds Group of answer choices are exceedingly rare, which is why their price is so high. are brought from the mantle to the surface in magma that hardens into kimberlite. of industrial quality (non-gem quality) have no use and are usually discarded. are found in carrot-shaped structures called pegmatites.

are brought from the mantle to the surface in magma that hardens into kimberlite.

Explanation:

Diamonds were formed billions of years ago due to the heat within the Earth's crust. The pressure and heat then results into diamonds which are formed from the crystalization of carbon atoms.

Therefore, diamonds are brought from the mantle to the surface in magma that hardens into kimberlite.

the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.