Plants by Rivera, Andrea
Boats by Rivera, Andrea
Screws by Rivera, Andrea
Levers by Rivera, Andrea
Pulleys by Rivera, Andrea
Wedges by Rivera, Andrea
Conservation by Rivera, Andrea
Ores by Rivera, Andrea
Soils by Rivera, Andrea
Glass by Rivera, Andrea
Water by Rivera, Andrea
Recycling by Rivera, Andrea
Inclined Planes by Rivera, Andrea
Wood by Rivera, Andrea
Minerals by Rivera, Andrea
Motorcycles by Rivera, Andrea
Gems by Rivera, Andrea
Airplanes by Rivera, Andrea
Hurricanes by Rivera, Andrea
Tsunamis by Rivera, Andrea
Cloth by Rivera, Andrea
Snow by Rivera, Andrea
Rain by Rivera, Andrea
Cars by Rivera, Andrea

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