8. Look at the picture above. What happened here? A) A giant glacier used to sit here, and water flowing into a hole on the surface fell to the bed and hollowed out a great pothole, seen here. B) A great volcanic explosion occurred, spreading material across the landscape, and the hole left behind after the eruption later filled with water. C) A sharp bend in a river created a whirlpool that carved the hole now filled by a lake. D) An immense marmot named George, shown here, dug the hole.
E) Death-Valley-type faulting dropped the bottom, making space for the lake; during the Ice Age, Death Valley looked like this, too.Feedback: Nature has many ways to make holes, and many other ways to make mountains. Part of this class is learning to read the clues, just as geologists do. We saw at Death Valley that the faults tend to makestraight lines. Streams on glaciers are not nearly this big, nor are river bends. And while George is cute, he could never dig such a hole. This is the crater of Crater Lake, almost 2000 feet deep and 6 miles across, left by the cataclysmic eruption of Mount Mazama in Oregon. Points Earned: 1.0/1.0
Correct Answer(s):B 9. Mt. St. Helens, in the state of Washington: Points Earned: 0.0/1.0
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