Why is dirt almost always a brown color?
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You know rust? Those orange-brown crumbs that form on things made of iron if they‘re left in a humid environment for too long? Earth‘s crust contains a lot of iron and the same thing happens with the iron that‘s in the environment. It then spreads everywhere and mixes with other stuff in the environment, but that other stuff is often colorless (white, gray, black), so the brown tone from the iron is what‘s determining the color.
A few elements are more common in earth‘s crust than iron (for example: silicon and aluminium), but stuff that contains those elements is usually gray or white – stones, for example.
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