Which of the following isotopes can be used by geologists to date rocks?
A) C-14
B) I-131
C) Sr-90
D) U-238
D
Environmental & Atmospheric Sciences
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How are changes in climate predicted to affect natural ecosytems, including forests and insects?
What will be an ideal response?
Environmental & Atmospheric Sciences
What percentage of the world's population lives in the developing world?
A) 30% B) 40% C) 60% D) 75% E) 80%
Environmental & Atmospheric Sciences
Arsenic-74 is a positron emitter. What isotope is formed when 74As emits a positron?
A) 75Br B) 70Ga C) 74Ge D) 74Se
Environmental & Atmospheric Sciences
Those organisms of ecosystems which feed on dead plant and animal material, promote decay, and return mineral nutrients to the soil are called ____________________
Fill in the blank(s) with correct word
Environmental & Atmospheric Sciences