Students view an illustration of the Hudson River watershed and identify the bodies of water shown. They discuss what happens when fresh and salt water mix. Students view a teacher demonstration of the stratification of fresh and salt...

Learners investigate the dangers of radiation by exploring recent nuclear tragedies.  In this scientific debate lesson plan, students define the idea of radiation "half life" and determine if low doses of radiation are truly...

Fourth graders experiment to find the effects of exercise on the heart rate.  In this exercise and heart rate lesson, 4th graders create questions about exercise and heart rate. Students use the scientific method to test and analyze...

Students discover what an atlatl is and how to use it. In this Native American lesson, students discuss the history of the Native American atlatl and practice throwing with it. Students will analyze the effects of the atlatl in terms of...