- Talus Pile or Talus Slope
- Tectosilicates
- Telescope
- Temperature and Temperature Scales
- Tereshkova, Valentina (1937- )
- Terra Satellite and Earth Observing Systems (EOS)
- Tertiary Period
- Thermosphere
- Thomson, Lord Kelvin, William (1824-1907)
- Thunder
- Tides
- Till
- Time Zones
- Tombaugh, Clyde W. (1906-1997)
- Topography and Topographic Maps
- Torino Scale
- Tornado
- Torricelli, Evangelista (1608-1647)
- Transform Faults
- Transform Plate Boundary
- Triassic Period
- Tropical Cyclone
- Troposphere and Tropopause
- Tsunami
- Tufa
- Tuff
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