"It is water."
Translation:Det er vann.
Read this short article for the menaings and difference of "den" and "det". http://knownorwegian.tumblr.com/post/80589314300/what-is-the-difference-between-den-and-det. I'm as new to this as you are. "Det" can also mean "this" and "den" can also mean "it". The best way to observe how things are used is to watch Norwegian TV wherever you can find it and turn on Closed Captions. Then, observe how they talk. It helped me a lot with my Spanish. Happy norsking.