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science elements life school middle middleschool magma voice metamorphic rock cycle introduction basic eighth grade granite animation seventh grade the rock cycle pumice narrated eighth seventh rocks lava easy minerals igneous 7th grade rehearsed timing 8th grade rock cycle sandstone sedimentary middle school organsystems organisms systems organ organs tissues cells organization hierarchy thermometer psychrometer balloon anemometer human body sulfer nitrogen hydrogen oxygen periodic physical 7th grade 5th elementary college high game mixtures compounds table weather instruments barometer.