variable volcano wheel and axle
pulley reflection refraction reproduce
earthquake electrical circuit electricity
chemical change classification conductor
conservation constellation consumer
erosion evidence force fossil friction
inclined plane inherited traits insulator
stationary object survival universe
lever magnetic metamorphic rock
microscopic mineral motion organism
resistance revolution rotation scientific
adaptation atomosphere balance scale
physical change position producer protest
method sediment sedimentary rock speed
fulcrum galaxy hypothesis igneous rock
decomposer density deposition direction