Answer:

Day and night are that which always break but does not fall and if fall cannot break.

Answer:

'Night and Day'

Explanation:

The question is an age old riddle, answer being- Night fall (when the sun is set and it goes dark) and break of day (dawn as you might say).

Can't get a more suitable answer.

Yes it is a riddle,i have asked this to a lot of friends.

Hope it Helps...

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