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Middle school students from Spring Ridge Middle School in St. Mary's... ニュース写真アメリカ合州国,アメリカ航空宇宙局,アメリカ連邦議会,アースデイ,スポンサー,ロケット,ワシントンDC,ワシントンDC ユニオン駅,中学校,地域,学生,実験,政治,横長,炭酸入り,祝いごと,科学,紙,観光,観光客Photographer 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)