Students examine the observed world, molecular world, and the symbolic world of chemistry. They observe a demonstration of the conductivity of solutions, describe the properties of acids and bases, and predict the outcome of solution...

Students use beach profile data to analyze how erosion and sediment transport changed seashore slopes. In this geology lesson, students plot the data provided and analyze erosion patterns. They also assess coastal erosion management...

Amy Adkins reveals the top seven reasons why we might dream. [5:38]