Oceans
Does the height of water flow affect it's rate/speed?
Yes, water will flow faster down a higher, steeper slope than a lower, flatter one.
When water forms on the outside of a cup, where does that water come from?
The atmosphere
Why does water form/condense on the outside of a cold cup?
Because of the difference in temperature between the cold liquid in the cup and the warm air.
Name two materials that make a great filter.
Answers vary. Possibilities include: charcoal, sand, coffee filter, rocks/pebbles, cloth/gauze...
Is clean, clear water always safe to drink?
No, there could still be bacteria in clean-looking water.