TAILIEUCHUNG - The official guide to the toefl ibt third edition part 21

This Official Guide has been created to help English language learners understand the TOEFL® Internet-based Test (iBT) and prepare for it. By preparing for the test, you will also be building the skills you need to suc-ceed in an academic setting and go anywhere in your career, and in life. | TOEFL iBT Listening Examples Professor Uh other things that glaciers can do is uh as they retreat instead of depositing some till uh scraped up soil in the area they might leave a big ice block and it breaks off and as the ice block melts it leaves a depression which can become a lake. These are called kettle lakes. These are very critical ecosystems in this region um because uh uh they support some unique biological diversity these kettle lakes do. The Great Lakes are like this they were left over from the Pleist from the Pleistocene glaciers uh the Great Lakes used to be a lot bigger as the glaciers were retreating some of the lakes were as much as a hundred feet higher in elevation. The beach of a former higher stage of Lake Erie was about fifty miles away from where the beach the current beach of Lake Erie is right now. So I just wanted to tell you a little bit more about glaciers and some positive things uh that we get from climate change like the ecosystems that develop in these kettle lakes and how we can look at them in an environmental perspective . . . What are kettle lakes O Lakes that form in the center of a volcano O Lakes that have been damaged by the greenhouse effect O Lakes formed by unusually large amounts of precipitation O Lakes formed when pieces of glaciers melt How did the glaciers affect the Great Lakes O They made the Great lakes smaller. O They made the Great Lakes deeper. O They reduced the biodiversity of the Great Lakes. O They widened the beaches around the Great Lakes. Explanation The answer to the first question is found in the beginning of the lecture when the professor explains what a kettle lake is. Remember that new terminology is often tested in Detail questions. The answer to the second question is found later in the lecture where the professor says . . . the Great Lakes used to be a lot bigger as the glaciers were retreating . . . Pragmatic Understanding Questions Pragmatic Understanding questions test understanding of certain

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