Kids Riddles

Question: Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Question: I open to close but I close to open.
I'm surrounded by water but I'm never soaking.

What am I?

Question: Paul is 20 years old in 1980, but only 15 years old in 1985.How is this possible?

Question: I only point in one direction,
but I guide people around the world.

What am I?

Question: A natural state, I'm sought by all.
Go without me, and you shall fall.
You do me when you spend,
and use me when you eat to no end.

What am I?