A question about the SEA?

Question

about this strange thing,there are few questions about it from me:

1. why is it blue in colour?

2. why is it salty?

3. where does the fish came from?

4. why is the dead sea way more salty,its nine time the salt than ordinary seas

best answer for the best answer that can satisfy me.........

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Answer 1

Here is a place that you can start with to find your answers.

http://en.wikipedia.org/wiki/Ocean