Which of the following is typically the largest source of radiation exposure for humans?

A) artificial radiation sources
B) atmospheric radon
C) cosmic rays
D) terrestrial radiation


B

Environmental & Atmospheric Sciences

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The lower atmosphere is a homogeneous mixture of gasses with nitrogen and oxygen being the most

abundant. Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

In the first stage of the demographic transition, crude birth rate is ________ and crude death rate is ________

A) low; high B) high; low C) low; low D) high; high

Environmental & Atmospheric Sciences

Red light travels the ________ and is therefore bent the ________

A) fastest; least B) slowest; least C) fastest; most D) slowest; most

Environmental & Atmospheric Sciences

Which of the following is true of migrating centers of low pressure in the Northern Hemisphere?

A) The winds diverge from the pressure system and spiral outward in a clockwise fashion. B) These pressure systems tend to move east to west along storm tracks. C) These pressure systems are characterized by converging, ascending air that spirals inward in a counterclockwise fashion. D) They form only a minor weather pattern in the middle and higher latitudes.

Environmental & Atmospheric Sciences