progradation

[proh-grey-dey-shuhn]

pro·gra·da·tion

[proh-grey-dey-shuhn]
noun Geology.
seaward growth of a beach, delta, fan, etc., by progressive deposition of sediment by rivers or shoreline processes.

Origin:
1905–10; prograde (pro-1 + (retro)grade) + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To progradation

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Progradation is always a great word to know.
So is percolation. Does it mean:
slow movement of water through the pores in soil or permeable rock
tectonic boundary where two plates are moving toward each other
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