Scores of colors ... like Space photo of the day: Brilliant comet shines at sunset over observatory in Chile Wispy comet photobombs 'rare' planetary parade above Chile's Atacama Desert (photos ...

and mentally put yourself in a cool forest glen and then in a desert inferno. Cool colors, like blues and greens predominate in that forest and warm colors like reds and oranges in that desert.

What are the metal compositions of the different colors of rocks in places like the Painted Desert? The red ones have iron? The white rocks have gypsum? But what metals are in the blue ones ...