How water goes around
I've noticed that some folks are a bit fuzzy about the way Earth's water cycles. (Maybe they were thinking more about recess than about what the teacher was saying.) Anyhow, the link is to one of the best simple-but-comprehensive explanations I've seen recently. Yes, it's from Canada, but the site is in English. I highly recommend reading the whole page and then clicking on the "Groundwater" link -- also very clear and understandable.
What goes around, comes around!
Here is a link that might be useful: hydrologic cycles