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 type of rock shown in this photograph is
A) conglomerate.
B) breccia.
C) sandstone.
D) shale.
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