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Outcrop
Any place where bedrock is visible on the surface of the Earth.
Outflow
Air that flow outward from a thunderstorm.
Overcast
Sky condition when greater than 7/8 of the sky is covered.
Overdraft
To remove more water than is replenished. See groundwater mining.
Overland flow
The part of surface runoff that flows over the land surface toward stream channels.
Oxidize
To chemically transform a substance by combining it with oxygen. See chemical reaction.
Oxygen cycle
Cyclic movement of oxygen in different chemical forms from the environment, to organisms, and then back to the environment.
Ozone
A form of oxygen containing 3 molecules, usually found in the stratosphere, and responsible for filtering out much of the sun's ultraviolet radiation.
Ozone (O3)
A colorless gas with a pungent odor, having the molecular form of O3 , found in two layers of the atmosphere, the stratosphere (about 90% of the total atmospheric loading) and the troposphere (about 10%). Ozone is a form of oxygen found naturally in the stratosphere that provides a protective layer shielding the Earth from ultraviolet radiation's harmful health effects on humans and the environment. In the troposphere, ozone is a chemical oxidant and major component of photochemical smog. Ozone can seriously affect the human respiratory system. See atmosphere, ultraviolet radiation
Ozone depleting substance (ODS)
A family of man-made compounds that includes, but are not limited to, chlorofluorocarbons (CFCs), bromofluorocarbons (halons), methyl chloroform, carbon tetrachloride, methyl bromide, and hydrochlorofluorocarbons (HCFCs). These compounds have been shown to deplete stratospheric ozone, and therefore are typically referred to as ODSs. See ozone.

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