Learn how bird poop can contribute to cloud formation, in this video from NOVA’s Gross Science series. Clouds form when water vapor cools in the atmosphere and attaches to condensation nuclei. Condensation nuclei can be made from dust particles, ice crystals, specks of pollution, and even fungal spores. Bacteria that feed on bird poop release ammonia that form condensation nuclei when mixed with sulfuric acid, water, and other molecules in the air. Because bright clouds reflect sunlight, bird poop may play an important role in Earth’s climate. This resource is part of the NOVA: Gross Science Collection.
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