Sinkhole, dude!

In the book Tangerine, the main character's portable classroom gets sucked into a sinkhole. For many of you it was the first time you've heard of such a phenomenon. However, as we read recently, sinkholes can be extremely common in certain parts of the world, including parts of Pennsylvania (not the part that we're in, luckily). Often, sinkholes are created by people. What are they doing to create these scary events?

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Watch this video.

Watch the video and write three questions that come up for you about the video.