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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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altitude animals Appalachians Atlantic basins beach birds bison bogs canyon caves cliffs coast coastal color Colorado Colorado Plateau Colorado River conifers continent desert Douglas fir dunes eastern erosion eruption falls feet high flowers flows forest formations formed geyser giant sequoia glaciers gorge grasses grassland grow Gulf Gulf of Mexico height hemlock ice sheet insects islands lakes land landscape lava layer leaves limestone melt Mexico miles million Mississippi moisture Mount Mount Washington mountains National Forest National Monument National Park nearly northern numerous ocean Pacific peaks pine places plains plants plateau prairie prairie dogs ranges redwood ridges rise River Rockies rocks roots sand sediments seedlings sequoias shore shrubs Sierra Sierra Nevada Sitka spruce slopes Smokies soil southern species spring spruce square miles streams summit surface swamps tides timberline trees uplifted valley vegetation virgin volcanic waves western western hemlock wind zone