________ and ________ are the two drinking water contaminants thought to pose an immediate health threat
Fill in the blank(s) with correct word
Nitrate, coliform bacteria
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Define "geocoding."
What will be an ideal response?
In 1948 in Donora, Pennsylvania, the routine release of toxins into the air became a deadly fog because of
A) a chemical spill in the nearby Monongahela River. B) greatly increased activity of the nearby industries. C) a thermal inversion and stagnant weather conditions. D) the failure of the chemical scrubbing systems on smokestacks.
The _______________ humidity of a parcel of air is expressed as a percentage of saturation
Fill in the blank(s) with correct word
Polar regions receive nearly continuous sunlight in the summer months so why doesn't the mean temperature during those months get above 10°C?
A) The reflection of the sun's energy (albedo) by the ice and snow prevents the area from warming. B) The sun's energy has to heat the frozen atmosphere in order to reach the land and that takes all summer. C) In the summer, the winds blow from the cold oceans and keep the temperatures low. D) The sun is too low in the sky to be an effective heat source. E) The ozone layer has thinned significantly over the polar regions and this prevents heat from being trapped near the surface in those areas.