First graders at P.S. 290 share their research, questions, and opinions as they investigate the New York City Subway.
Wednesday, April 18, 2012
Explosives by Rachel
Explosives are a type of bomb. Workers use explosives to get boulders out of the ground. We talked to Second Avenue Subway workers and found out. They will be exploding under Second Avenue soon.
They drill holes in boulders and put clay-dough explosives in them, and press a button and BOOM! Then, they take the rocks out of the ground and take them to a store where it gets used on other construction sites.
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