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