In this activity, students explore the effect of chemical erosion on statues and monuments. They use chalk to see what happens when limestone is placed in liquids with different pH values. They also learn several things that engineers are doing to reduce the effects of acid rain.

In this video, Jonathan examines the biology of coral reefs and their importance to the marine ecosystem. Please see the accompanying lesson plan that discusses pH and ocean acidification for educational objectives, discussion points and classroom activities.

Students are briefly introduced to Maxwell's equations and their significance to phenomena associated with electricity and magnetism. Basic concepts such as current, electricity and field lines are covered and reinforced. Through multiple topics and activities, students see how electricity and magnetism are interrelated.

In this comprehensive unit, titled "From Raw Materials to Concrete: The Science of Portland Cement Manufacturing," students will embark on a fascinating exploration of the entire process of Portland cement production. They will delve into the fundamental aspects of Portland cement, including its definition, constituents, functions, and various types. Students will also explore the processes involved in cement manufacturing, focusing on both the wet and dry methods. They will differentiate between these production processes, analyzing their advantages, and disadvantages. 

In a quiet forest in central Florida, a mysterious pond filled with warm clear water hides a secret at the bottom. In this video, Jonathan explores the pond to find a spring which leads into a cave. As Jonathan travels underground, he meets unexpected marine life in the dark depths and learns how water travels through an aquifer from the underground world to the surface. Please see the accompanying study guide for educational objectives and discussion points.

This hands-on activity explores five different forms of erosion (chemical, water, wind, glacier and temperature). Students rotate through stations and model each type of erosion on rocks, soils and minerals. The students record their observations and discuss the effects of erosion on the Earth's landscape. Students learn about how engineers are involved in the protection of landscapes and structures from erosion. Math problems are included to help students think about the effects of erosion in real-world scenarios.

Deep underneath Mexico‰ŰŞs Yucatan peninsula, underground rivers wind their way to the sea. In some places, the forest floor has fallen in, leaving holes in the ground to access these mysterious underwater caves. The holes, called cenotes, were considered openings to the underworld by the ancient Mayans. In this video, Jonathan teams up with an expert cave diver to explore these spooky underground rivers. Please see the accompanying lesson plan for educational objectives, discussion points and classroom activities.