In the Ocean Rover Wheel & Axle Lab, students become deep-sea mobility engineers as they investigate how wheel size, axle placement, and surface friction affect a rolling rover's performance on the ocean floor. Set inside the Ocean Explorers narrative theme, this 2-week unit immerses Grade 2 students in hands-on wheel-and-axle science — building, testing multiple configurations, collecting data, and using evidence to identify the most effective design before committing to a final build. What St