What do airplanes, power plants, ships, and explosions have in common? They all make clouds!

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Sources:
https://www.nasa.gov/sites/default/files/atoms/files/contrails_k-12.pdf
https://science-edu.larc.nasa.gov/contrail-edu/science.php
https://science-edu.larc.nasa.gov/contrail-edu/resources-activities-appleman_student.php
https://www.faa.gov/regulations_policies/policy_guidance/envir_policy/media/contrails.pdf
https://science-edu.larc.nasa.gov/contrail-edu/history.php
https://earthobservatory.nasa.gov/IOTD/view.php?id=81061&eocn=image&eoci=related_image
https://earthobservatory.nasa.gov/IOTD/view.php?id=77345&eocn=image&eoci=related_image
https://earthobservatory.nasa.gov/Features/Pollution/
https://www.wmocloudatlas.org/homogenitus.html
https://www.wmocloudatlas.org/homogenitus.html
https://www.skybrary.aero/index.php/Pyrocumulus
https://www.nasa.gov/press-release/nasa-study-confirms-biofuels-reduce-jet-engine-pollution

Images:
https://commons.wikimedia.org/wiki/File:A340-313X.jpg
https://commons.wikimedia.org/wiki/File:Contrails_over_Nova_Scotia.jpeg
https://commons.wikimedia.org/wiki/File:ShipTracks.jpg
https://commons.wikimedia.org/wiki/File:Belchatow-elektrownia.jpg
https://commons.wikimedia.org/wiki/File:Mushroom_cloud.svg
https://commons.wikimedia.org/wiki/File:BusterJangle-Charlie.jpg