Andover Townsman, Andover, MA

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140211_AT_CRU_SCIENCEFAIR_1

Fifth-graders James Horkan, top, and Joseph Ardizzone react as droplets of "lava" shoot into the air before flowing out of their volcano during the Bancroft School Science Expo. The ''explosion'' was caused by blocking the hole of their volcano for 10 seconds after pouring vinegar inside, which allowed pressure to build up inside.

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