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Troposphere: The lowest layer of the atmosphere and contains about 95 percent of the mass of air in the Earth's atmosphere. The troposphere extends from the Earth's surface up to about 10 to 15 kilometers. All weather processes take place in the troposphere. Ozone that is formed in the troposphere plays a significant role in both the greenhouse gas effect and urban smog. See ozone precursors, stratosphere, atmosphere.
Tropospheric ozone (O3): See ozone.
Tropospheric ozone precursors: See ozone precursors.
Trough: An elongated area of low pressure at the surface or aloft.
Tsunami: An ocean wave generated by a submarine earthquake, volcano or landslide. (Also known as a seismic seawave, and incorrectly as a tidal wave).
Turbulence: Disrupted flow in the atmosphere that produces gusts and eddies.
Typhoon: A hurricane that forms in the Western Pacific Ocean.