At what time of year is the earth's axis not tilted either toward or away from the Sun?
A) autumnal equinox
B) aphelion
C) summer solstice
D) perihelion
E) winter solstice
A
Environmental & Atmospheric Sciences
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Which of the following would result in atmospheric cooling?
A. aerosols B. fires C. greenhouse gases D. land clearing
Environmental & Atmospheric Sciences
What percentage of parent isotope is remaining if 1 half life has elapsed?
- 6.25%
- 12.5%
- 25%
- 50%
- 100%
Environmental & Atmospheric Sciences
Increases in agricultural yields will only be realized through major expansion of cultivable land
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
What could happen if this well is overpumped? 
A. The water table will drop, causing sand to flow into the well. B. It will yield more water over time. C. It will run out of water and become a dry well. D. The bottom of the lens of fresh water will rise, causing the well to draw in salt water.
Environmental & Atmospheric Sciences