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