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Middle school students from Spring Ridge Middle School in St. Mary's... Nieuwsfoto'sBrugklas,Congres van de Verenigde Staten,Dag van de Aarde,Horizontaal,Koolzuurhoudende drank,NASA,Papier,Politiek,Raket,Sponsor,Stadsdeel,Studerende,Toerisme,Toerist,Union Station - Washington DC,Verenigde Staten,Viering,Washington DC,Wetenschap,Wetenschappelijk experimentPhotographer Collection: CQ-Roll Call Group © 2012 CQ Roll CallUNITED STATES - APRIL 22: Middle school students from Spring Ridge Middle School in St. Mary's County, Md., conduct an experiment with a paper rocket and effervescent tablets in Union Station as part of an Earth Day celebration sponsored by NASA. (Photo By Tom Williams/CQ Roll Call)