Environmental Science
The ratio of the mass of water vapour in a given volume (parcel) of air to the mass of the remaining dry air describes the:

Absolute humidity
Mixing ratio
Relative humidity
Dew point

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Environmental Science
An important reason for the large daily temperature range over deserts is:

The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
There is little water vapor in the air to absorb and re-radiate infrared radiation
Free convection cells are unable to form above the hot desert ground
Dry air is a very poor heat conductor

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Environmental Science
What is the official name of IUCN?

International Union for Conservation of Nature and Natural Resources
World Wide Fund for Nature
United Nations Educational, Scientific and Cultural Organization
United Nations Environment Programme

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