What am I?

I can cycle many hours but I don’t get tired even at the end of the day. What am I?

I am owned by every man, through my length differs. Their wives use me after getting married. What am I?

I have four legs but no tail. Usually I am heard only at night. What am I?

I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?

Riddles and Answers