Environmental Science
Man made sources of radiation pollution are:

mining
explosion of nuclear weapons
all of these
nuclear fuels and preparation of radioactive isotopes

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Environmental Science
Which of the following statements is not correct?

During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
A change in the air temperature can change the relative humidity.
The length of human hair changes as the relative humidity changes.
The relative humidity is a measure of the air's actual water vapor content.

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of visible light by clouds
Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by the atmosphere

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