Amazon River |
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BT | South America | | .Amazon River | UF | Rio Amazonas | RT | Brazil | | Peru | | Colombia | | Marajo | SN | Largest river in the world if measured by volume of water carried. Rises in 2 major headstreams in the Peruvian Andes flowing N and then E across N Brazil into the Atlantic Ocean. Before 1978, also search Amazon. Indexed with countries as applicable. |
Amazonas |
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SN | No longer a valid term for GeoRef. See Amazonas Brazil, Amazonas Colombia, Amazonas Peru or Amazonas Venezuela. For Rio Amazonas, use Amazon River. |
Amazonian |
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RT | Mars | SN | Youngest system of three in the Martian stratigraphic column. Added to Thesaurus in 1993. |
Amazonis Planitia |
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BT | Mars | | .Amazonis Planitia | SN | Low plain. For references to Amazonis albedo feature, also search Amazonis. |
Amelia |
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RT | Virginia | SN | Mineral bearing region in Amelia County in S central Virginia. Indexed with county and state as applicable. |
American Association of Petroleum Geologists |
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USE | AAPG |
American Geological Institute |
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USE | AGI |
American Geophysical Union |
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USE | AGU |
American Museum of Natural History |
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RT | museums | | New York | SN | In New York City. Not to be indexed with geography. |
Amphineura |
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SN | Not a valid term for GeoRef. Use Aplacophora or Polyplacophora. |
amplification |
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SN | As of 1995, not a valid term for GeoRef. Use wave amplification if applicable. |
AMS C-14 dating |
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SN | Not a valid term for GeoRef. As of 1993, use C-14 and accelerator mass spectroscopy and absolute age. |
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