Birdwatch Note Rating
2023-05-12 11:58:35 UTC - HELPFUL
Rated by Participant: 8BD92BE8D6158CAD5C5E176B07B56E2126C4F1377D5FE639D1A9D230C09854C4
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Original Note:
Contrails are line-shaped clouds produced by aircraft engine exhaust miles above Earth's surface. Contrails are composed primarily of water, in the form of ice crystals. This phenomenon is reproducible via many experiments. Contrail properties observed and studied since 1920s https://www.nasa.gov/sites/default/files/atoms/files/contrails_k-12.pdf
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