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Who Invented the Mountain Bike?
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How Long Would It Take To Walk Across America?
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Can You Read a Topographic Map?
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What Are Sailing Stones?
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How Much Snow Do You Need To Ski?
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Why Do Snails Leave Slime Trails?
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How Do You Read a Map?
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Do You Leave a Trace?
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Do All Animals Leave Tracks?
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Does Every State Have a National Park?
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How Deep Is the Grand Canyon?
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Why Do Airplanes Leave Tracks In the Sky?
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What Is a Dog Sled?
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