eli5: Why do worms get out on the asphalt when it’s raining?
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Worms can sense the change in atmospheric pressure which indicates coming rain. While it’s true that they absorb oxygen through their skin, they move out of the ground preemptively to avoid drowning as water holds less oxygen than air. Even when the soil isn’t rained upon, such as in a covered, plastic worm compost bin, the worms will come out and climb up the sides and out of the bin.
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