https://padlet.com/jfgretz/b4ts1j32vqwj cancer en-us 2018-03-15 20:44:23 UTC 2018-03-15 20:44:43 UTC hello@padlet.com jfgretz https://padlet.com/jfgretz/b4ts1j32vqwj/wish/242596209 Waves are movement caused by some form of energy and can be found in light, sound, heat, and as most know in water or other liquids. ]]> 2018-03-15 20:44:24 UTC https://padlet.com/jfgretz/b4ts1j32vqwj/wish/242596209