"Travertine is a form of limestone deposited by mineral springs, especially hot springs.
Would you please explain what "deposited by mineral springs" mean here and which of the following meanings of "deposit" fit with it?
http://www.wordwebonline.com/search.pl?w=deposit
Thank you.
com/definition/us/deposit : (of water, the wind, or other natural agency) lay down (matter) gradually as a layer or covering.
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Defn 1.1 at https://en.oxforddictionaries.com/definition/us/deposit:
(of water, the wind, or other natural agency) lay down (matter) gradually as a layer or covering.