- Abyssal Plains
- Acid Rain
- Adamantine
- Adiabatic Heating
- Advection
- Aerodynamics
- Africa
- Agassiz, Louis (1807-1873)
- Agricola, Georgius (1494-1555)
- Air Masses and Fronts
- Alkaline Earth Metals
- Alloy
- Alluvial System
- Aluminum
- Alvarez, Luis (1911-1988)
- Amorphous
- Analemma
- Andesite
- Anning, Mary (1799-1847)
- Antarctica
- Aphanitic
- Aquifer
- Archean
- Archeological Mapping
- Area
- Aretes
- Armstrong, Neil (1930- )
- Arrhenius, Svante August (1859-1927)
- Artesian
- Asia
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