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

:calculate the sum of the interior angles of a 13-sided polygon.

What could the united states of america do to improve their status? name at least 3(ap human geography)

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.