Fifth graders in Mrs. Richardson's class at the Henniker Community School explored changes in the states of matter. To learn about sublimation and physical changes to matter, they created  dry ice "boo bubbles."
Fifth graders in Mrs. Richardson's class at the Henniker Community School explored changes in the states of matter. To learn about sublimation and physical changes to matter, they created dry ice "boo bubbles." Credit: —Courtesy

Fifth graders in Mrs. Richardson’s class at the Henniker Community School explored changes in the states of matter. To learn about sublimation and physical changes to matter, they created dry ice “boo bubbles.”