What is the hardest mineral?

What will be an ideal response?


diamond

Environmental & Atmospheric Sciences

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The philosophy of classical economics developed by Adam Smith ________

A) assures equality between rich and poor B) advocates free-market policies that many credit for the tremendous gains in material prosperity of industrial nations C) proposes maintenance of economies through government restraint and regulation D) was adopted by the Aborigines in the Kakadu region of Australia E) argues that individuals acting in their own self-interest harm society

Environmental & Atmospheric Sciences

What proportion of urban Americans lives in central cities?

A. one-tenth B. one-quarter C. one-third D. one-half E. two-thirds

Environmental & Atmospheric Sciences

Urban runoff is an example of a type of ________ ________ pollution

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences

Which country is Africa's leading trade partner?

a. the United States b. Russia c. India d. China e. Germany

Environmental & Atmospheric Sciences