This Mystery Science astronomy lesson is terrific! The activity and video lesson made this concept very understandable.
Bottle Ecosystem, This is the most awesome class idea to teach ecosystems! Its self contained and you can observe the activity for the rest of the year. No mess no fuss and all of this cost about 17 dollars.
Site may be a good resource or videos and visuals. Pre-reading material? Lab Tips in Types of Bonds and Orbitals
You know more about the electromagnetic spectrum than you may think. The image below shows where you might encounter each portion of the EM ...