Fourth graders sort and classify wood.  In this sorting tree products lesson, 4th graders sort and classify tree parts and pieces of wood, both natural and manufactured according to their properties. 

Students identify and interpret where and how erosion takes place. Students list various ways to prevent erosion from occurring. Students conduct an experiment in small groups on erosion and predict what they believe will happen.

In this interactive tutorial you will learn about geological resources. Learn what the types of resources are and concentrate on learning about mineral resources and how they are obtained and used, and then about energy resources and...