De or het korstvorming?

The correct Dutch article is:

de korstvorming

Rule Words ending in -ing: almost always de. See the rule

How to use korstvorming

the korstvormingde korstvorming
this korstvormingdeze korstvorming
that korstvormingdie korstvorming
our korstvormingonze korstvorming
your korstvormingjouw korstvorming
every korstvormingelke korstvorming
which korstvorming?welke korstvorming?
a big korstvorming / the big korstvormingeen grote korstvorming, de grote korstvorming