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