Help with Chords for a classroom song

Hey--

Can anyone help me with the chords for this song I use with my kids in my science class:

http://www.youtube.com/watch?v=bjOGNVH3D4Y

I really just want the chorus... I am pretty sure it starts off 

C

Radio waves

E

Microwaves

G

Infrared---

and then I get completely lost. 

I know there are alot of people who are really good things like this (I wish I was but dont have the ear) so any help would be greatly appreciated...

Thanks in advance!!!