Transcription: Yellowstone's geysers, hot springs and mud pots are evidence of volcanic forces that still rumble beneath the earth. To preserve Yellowstone's unique natural features, it was made a national park in 1872. Since then, many other parks have been created, including Yosemite, where great granite peaks enclose a tranquil valley carved by glaciers. Powerful waterfalls plunge down its sheer walls. South of Yosemite, Sequoia National Park protects groves of giant sequoia trees, the world's largest living things. The largest native eastern woodland cloaks the lofty peaks of the Great Smoky Mountains. T ...
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