This is a song that was put together by a 6th grade teacher to help his students learn about how objects appear different colors and how surfaces affect visible light.
This resource has several lessons consisting of short, on grade level readings, followed by questions. I would not use this in entirety but could see me pulling out Lesson 3-1 (What is a Beneficial Insect?), Lesson 3-2 (Predators), Lesson 3-3 (Pollinators) and Lesson 3-4 (Recyclers and Decomposers).
The emerging set of interactive simulations at PhET that now use HTML5 and work solely within a modern browser. These are heavy in the physical sciences... but also include acid-base, atomic structure, chemical equations, etc.