Why do tumbleweeds tumble?

Tumbleweeds might be the iconic props of classic Westerns. But in real life, they’re not only a noxious weed, but one that moves around.

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Everything You Need to Know About Tumbleweeds

This is what a tumbleweed looks like before it dies and roams the land. : r/mildlyinteresting

Drifting along like a tumbling tumbleweed

Why do tumbleweeds tumble?