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altimeter amphibians animals atoms barometer birds bottle bulb called carbon dioxide cause clouds coal coil color cool copper wire crops dissolved drinking straw dry cell earth ecules elec electric current electrons EXPERIMENT explorers farm farmer Fasten fish flows formed fuel glass grow hair happens heat hole hygrometer igneous rock inches inclined plane insect inside insulation iron keep kinds land layers light limestone liquid litmus paper living things look machines magma magnet mammals materials melting metal metamorphic rocks milk carton minerals molecules move navigation needle oxygen paper clip pencil picture piece plants potato pressure pull pulley push radio rain rubber band salt sand scientists screw sedimentary rock seeds shape ship soil solid spool straw sugar tell temperature thumbtacks tiny tube ture turn vapor warm weather wheel wind