Where does “karstautua” come from?

karstautua (Finnish) comes from Finnish karstata, from Finnish -tä, from Proto-Finnic -ta, from Proto-Uralic -tä — from.

Ancestry of “karstautua”, step by step

StepLanguageWordMeaning
1Finnishkarstatato card
2Finnish-täFront vowel variant of -ta
3Proto-Finnic-taPartitive ending
4Proto-Uralic-täfrom
Every word from Proto-Uralic -tä →Every word from Finnish -tä →Every word from Finnish karstata →