A stapler is used to staple 100 papers, it jams 5 times during the trial. A different brand of stapler performs the same test, it jams 22 times

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all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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bioteacher101