allochthon

[uh-lok-thuhn, -thon]

al·loch·thon

[uh-lok-thuhn, -thon]
noun Geology.
a geological formation not formed in the region where found and moved to its present location by tectonic forces. Compare autochthon (def. 3).

Origin:
1940–45; back formation from allochthonous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Allochthon is always a great word to know.
So is infiltration. Does it mean:
seepage of water into soil or rock
process where the surface of the earth is worn away by the action of water, glaciers, winds, waves
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