Where does “vaihettumisvyöhyke” come from?

vaihettumisvyöhyke (Finnish) comes from Finnish vaihettuminen, from Finnish vaihettua, from Finnish -ttua, from Finnish -ttää, from Proto-Finnic -ttadak, from Proto-Uralic -kta-.

vaihettumisvyöhyke (Finnish): ecotone

Definitions

ecotone

Ancestry of “vaihettumisvyöhyke”, step by step

vaihettumisvyöhyke traces back through two separate lines of ancestry.

via Finnish vaihettuminen

Step	Language	Word	Meaning
1	Finnish	vaihettuminen	—
2	Finnish	vaihettua	—
3	Finnish	-ttua	Forms inchoative or passive intransitive verbs...
4	Finnish	-ttää	Front vowel variant of -ttaa
5	Proto-Finnic	-ttadak	Creates causative verbs from regular verbs,...
6	Proto-Uralic	-kta-	—

via Finnish vyöhyke

Step	Language	Word	Meaning
1	Finnish	vyöhyke	zone
2	Finnish	vyöhyt	belt, especially a decorated belt
3	Finnish	vyö	belt, girdle; band; zone
4	Proto-Finnic	vöö	belt
5	Proto-Finno-Ugric	wiŋä	—

Every word from Proto-Uralic -kta- →Every word from Finnish -ttää →Every word from Proto-Finnic -ttadak →