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 How Do MASSIVE Sinkholes Form?
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What are sinkholes, and how do these mysterious things form? 


QUESTIONS: 

1. What are sinkholes?

2. How do you think sinkholes are formed?

3. Discuss recent information that you have heard about sinkholes.

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2017-10-19 ¿ÀÈÄ 4:20:57
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