It is often said that water seeks its own level. Explain?

Question

13-5, please help, thank you!

Answer 1

if you pour water on a hill - it will not form a puddle - but run downhill

only forming a puddle when it is level-or hollowed out

Answer 2

I really do not get what you want to know.

Liquids depends upon its surface tension. A complex physical property of all liquids.

That property reason why water is curved inside and mercury outside.

Answer 3

"Because pressure is evenly transmitted in the liquid."

This is the only thing I learnt from Pressure, in my physics textbook. Have fun!