Bill Nye showcases the different types of soil in his lab. He explains and illustrates the soil profile (what soil would look like if you can dig into it and view it from the side) of each type. He also explains how soil and dust are created: from rocks and living creatures.
Bill Nye is obssessed with erosion and explains that rocks change over time. He explains what causes weathering (although he calls it erosion): water, ice, wind, sand, and chemicals. He illustrates the process of erosion in his lab.
Bill Nye explains plate tectonics and the origination of its theory. The areas in which the tectonics spread apart is where volcanoes form. Conversely, the areas in which the tectonics come together is where mountains form.