1.  What lives in winter, dies in summer, and grows with its root upward?

 

An Icicle

 

2.  What three letters mean "stiff water"?

 

Ice

 

3.  What kind of bank needs no money?

 

A riverbank

 

4.  What runs and has no feet, roars but has no mouth?

 

The sea

 

5.  What runs but never gets tired?

Water, from a tap or a river