Environmental Science
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called

radioactive pollution
water pollution
air pollution
soil pollution

ANSWER DOWNLOAD EXAMIANS APP

Environmental Science
Frost forms when:

Objects on the ground cool below the dew point temperature.
All of these
The dew point is 32oF or below.
Water vapor changes into ice without first becoming a liquid.

ANSWER DOWNLOAD EXAMIANS APP