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North America 375 million 150 million and 50 million years ago
Fishing banks of New England and the Maritime Provinces
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animals Appalachians Atlantic Atlantic coastal plain basins beach birds bogs caves cliffs coast coastal color Colorado Colorado River continent desert Douglas fir dunes eastern erosion falls feet high flows formations formed geyser giant sequoia glaciers gorge Grand Canyon grasses grassland grow Gulf Gulf of Mexico hemlock ice sheet islands lakes land landscape lava layer leaves limestone lower melt Mexico miles million Mississippi montane Mount Mount Washington mountains National Forest NATIONAL MONUMENT National Park nearly North America northern numerous ocean Pacific peaks Peter Farb pine places plains plants plateau prairie prairie dogs ranges redwood ridges rise River Rockies rocks roots sand sediments sequoias shell shore shrubs Sierra Sitka spruce slopes Smokies soil southern species spring spruce square miles streams summit surface swamps tides trees uplifted valley vegetation virgin volcanic waterfalls waves western western hemlock WILD AREA WILDLIFE wind zone