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