BioEd Online
Bio Ed Online: About Air
In this lesson students will use popcorn of different colors to model the composition of air. They learn that gases occupy space, air is a mixture of different gases, and the oxygen needed by the human body is not the principal component...
BioEd Online
Bio Ed Online: Dust Catchers
Dust consists of individual particles of different substances. Even air that appears to be clean may contain dust and other pollutants. In this lesson students make a simple device to collect particles from the air at home or in the...