the difference between when, where, and which

I am confused as to why the “where” in the sentence

One domain where this is of considerable significance is music’s potentially damaging effects on the ability to drive safely.

cannot be a “which”. Same goes for the sentence

It had long been something of a mystery where, and on what, the northern fur seals of the eastern Pacific feed during the winter, which they spend off the coast of North America from California to Alaska.

Why can’t the “which” in the sentence be a “when”?

Answer

Basically the reason why is because they would have to be different sentences

One domain where this is of considerable significance
One domain in which this is of considerable significance

feed during the winter, which they spend off the coast of North America
feed during the winter, when they are off the coast of North America

it can not be a straight substitution.

Attribution
Source : Link , Question Author : Kevin Wang , Answer Author : Peter

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