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Life in a spring 61 Hot springs and geysers 62 Life
Snowpack and surface water 74 Rivers of ice 76 River
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adults algae aquatic bacteria banks bass beaver beetle beneath birds body bubble caddisfly caddisfly larvae catch caves Colorado River creatures cycle dams damselflies dobsonfly downstream dragonfly dragonfly nymphs eelgrass eggs energy falls feed feet female fish fishermen flood food chain forests fresh-water gills glaciers green plants Gulf of Mexico habitat hot springs inches insects Lake Lake Itasca lampreys land larvae legs living things mayfly mayfly nymphs Mexico microscopic migrating miles million Mississippi muddy muskrat mussels National Park nymphs organic wastes otter oxygen park's plankton plant stems plants and animals pollution ponds pool predators prey productivity reservoir River Basin rivers and streams rocks salmon sand scenic sewage shallows shell silt snow spawning species spectacular springtails stonefly stones stream bottom sunfish surface film survive swim thousands tiny transforms tributary trout turtles underground water underwater upstream usually Valley water strider waterfalls waterways wings