Question: At the beginning of the movie, Alan grant is at a dig in Montana. They load what looks like a bullet into a chamber and fire it into the ground. What was it they fired underground and why did they do it?
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Chosen answer: They are using a ground penetrating sonar device. A shotgun shell is discharged into the earth. The resulting blast creates sound waves that bounce off any underlying object, like fossils, and are transmitted to a receiver and seen on a TV monitor as images to reveal what is buried underground.
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