I get wetter as i dry..

Towel.

1043510.jpg
 
D: that was too fast
its a famous one.
1)i cannot exist without the sun, but when i look at it i die.
2)im full of holes and can still hold water.
3)what can hold a tree but not a nickel?
4)when you call it it disappears, what is it?
 
2 is a sponge i believe, i like the shadow one.
3 has stumped me (see what i did? :D)