Ore deposits of the element ________ do not require extreme concentrations because it is one of the most abundant elements in the Earth's crust

A) boron B) uranium C) carbon D) aluminum


D

Environmental & Atmospheric Sciences

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What is an indication that human activities have altered the natural nitrogen cycle?

A. explosive growths of algae B. explosive growths of sea bass C. explosive growths of canaries D. explosive growths of poison ivy

Environmental & Atmospheric Sciences

The major boundary that occurs at a depth of about 30 km below Earth's surface is the:a

low-velocity zone. b. Moho. c. inner core-outer core transition. d. core-mantle boundary. e. none of the above

Environmental & Atmospheric Sciences

What pattern is most likely associated with clear skies and fair weather?

A) high pressure regions B) low pressure regions C) a cold front D) a warm front

Environmental & Atmospheric Sciences

The type of rock shown in this photograph is



A) conglomerate.
B) breccia.
C) sandstone.
D) shale.

Environmental & Atmospheric Sciences