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Oasis	desert area where groundwater is tapped for crop irrigation and human needs
Ocean Current	persistent, dominantly horizontal flow of ocean water
Ocean Tide	periodic rise and fall of the ocean level induced by the gravitational attraction between the Earth and the Moon
Orographic	pertaining to mountains
Oxbow Lake	crescent-shaped lake representing an abandoned channel of a river
Ozone	a form of oxygen with a molecule consisting of three atoms of oxygen, O3
Ozone Layer	a layer of ozone in the altitude range 20 to 35 km (12 to 31 mi)
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