Chicago Botanic Garden
The Carbon Cycle
There is 30 percent more carbon in the atmosphere today than there was 150 years ago. The first lesson in the four-part series teaches classes about the carbon cycle. Over two to three days, classes make a model of the cycle,...
CK-12 Foundation
Seasonal Changes in Plants: Leaf Pigment
Leaves fall off the tree in the autumn, but why do they change colors? The interactive covers the role of chlorophyll and photosynthesis. It also explains both carotenoids and anthocyanins.
Wylie Independent School District
The Carbon Cycle
Carbon is the fourth most abundant element in the universe (in terms of mass), behind hydrogen, helium, and oxygen. Scholars learn about the carbon cycle, from ways carbon is removed from the atmosphere to how it is added in...
Ask a Biologist
It’s a Plankton Eat Plankton World
For as small as they are, plankton sure play an enormous role in maintaining marine ecosystems. Dive into an investigation of these tiny organisms with a hands-on life science activity in which children cut out pictures of sea...