Bill Nye explains why it gets colder as one travels up through the atmosphere. He uses miniature replicas of a city and a mountain to support his explanation. Bill also briefly touches upon the lapse rate.
Bill Nye explains that wind is caused by the heating and the cooling of the Earth. The Sun warms the air, causing it to move faster and spread out, and cold air pushes the warm air up. Wind comes from all different directions since it moves with the rotation of the Earth.
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.