Air Pressure

The force produced by the weight of the air pressing down on the earth. 


Source
https://www.youtube.com/watch?v=xJHJsA7bYGc

Cirrus clouds

Clouds that forms on partly cloudy days and are the highest type of clouds in the sky. 


Source
https://en.wikipedia.org/wiki/Cirrus_cloud

Cumulus clouds

A type of cloud that is puffy and occurs on partly sunny days.


Source
http://www.actforlibraries.org/characteristics-of-cumulus-clouds/

Stratus clouds

Clouds that are low and gray and sometimes bring rain or snow. 


Source
https://sciencesource.com/archive/Stratus-clouds-SS2107401.html