Why is look down for some of the questions?...?

Question

ocean blue? glaciers white?

traffic lights of colour red, yellow gree?

convex mirrors on vehicles?

your weight lessens while going down a lift though g increases?

and

why is - * - +?

Answer 1

There are plenty of scientific reasons, but as for the real reason, no one knows. That is like asking why we are here and what life really is.

People associate red with off (and stop) and green with on (and go), so that is why the traffic lights are like that (and yellow means caution).

Look up the scientific reasons. I bet that you can research on your own.