Why is dirt almost always a brown color?

Question

Why is dirt almost always a brown color?

In: 329

Answer 1

Hilariously both of these answers are wrong, it’s a combination of iron oxide which has a distinct red color (it’s what covers the Martian surface), and also organic material which gives it that darker brown color, also why potting soil is more black than your normal dirt (at least in regions that don’t have “good” soil)