Curated OER
A Question of Rivers
Interactive PowerPoints are terrific tools for self quizzing before an exam. This particular presentation is about the action and physical features of rivers. There are nine boxes to click on, each leading to a picture or map. When you...
CK-12 Foundation
Ck 12: Fourth Grade Science: Earth Science: Weathering
[Free Registration/Login may be required to access all resource tools.] Looks at mechanical and chemical weathering, agents of weathering, and gives examples of each type of weathering.