Minerals have many properties, such as hardness, that make them useful.
Often, a drill is needed that is able to drill through all other mineral and
material types. Which mineral could be applied to the tip of the drill in
order to accomplish this?

A. none of these will work
B. apatite
C. talc
D. diamond

Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective