Download Alaska Science Nuggets (Natural History) by Neil Davis PDF

By Neil Davis

Do iceworms consume ice?  are you able to listen the aurora?  How does mosquito repellent work?  Why are Alaskan volcanoes flippantly spaced alongside the coast?  Is it attainable for warm water to freeze quicker than chilly water?  the place are Alaska's greater than a hundred twenty five sizzling springs?  Why are northern twilights so long?  Do glaciers slide or do they flow?  Why do snowflakes flutter as they fall? In Alaska technology Nuggets, Neil Davis solutions those and plenty of different exciting questions within the interesting and informative type that makes him one in all Alaska's favourite technological know-how writers.  This compendium of approximately four hundred articles, together with articles through different participants to a technology column carried by way of a number of Alaska newspapers, discusses phenomena as varied because the northern lighting fixtures, permafrost, glaciers, meteorology, volcanoes, earthquakes, archaeology, Alaskan vegetation, mammoths, early people, and northerly living. Tourists and long-time Alaskans alike have made this much-loved booklet a bestseller for years.  Alaska technological know-how Nuggets is a brilliant reference or reward for someone attracted to the outstanding normal historical past of the North.

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Extra resources for Alaska Science Nuggets (Natural History)

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146 Halibut Fishing 146 The Alaskan Mosquito 147 Mosquito Repellents 148 Musk Ox Versus Man 149 Musk Ox Teeth 150 Reindeer and Caribou Population 150 Grouse Sounds 151 Wolf Rabies 151 Hibernation 151 On Hibernation 152 Bark Beetles in Spruce Trees 153 Supper on Ice 154 The Bowhead Whale 154 Baleen 154 Recovery of the Gray Whale 155 Life Underfoot 155 Earthworms 156 Alaskan Earthworms 156 Northern Butterflies 156 Alaska's First 300 Birder 157 Magnetic Navigation By Birds 158 Magnetic Bees 158 Gizzard Stones 159 Fossil Food 159 Plastic Pollution in North Pacific Seabirds 160 Purpose of Porpoises' Porpoising 160 Keeping Salmon Inside the 200-Mile Limit 160 Salmon Sense of Smell 161 Lunar Effects on Salmon 161 Earthquake-Sensing Fish 161 Chapter Nine Our Heritage Roots 163 People of the Bering Land Bridge 163 The Changing Scenery 164 Beach Ridge Archeology 164 Krusenstern's Chenier Plain 165 Mammoths and Mastodons 166 Mastodon and Man 166 Curious Mammoth Find 166 Mystery of the Mammoth and the Buttercups 167 Caribou Stew at Onion Portage 167 College Man 168 Seek and You Shall Find 168 Local Archeological Find 168 ManThe Deadly Killer 169 Bows and Arrows 169 An Alaskan Mummy 169 Alaska Native Languages 170 Alaskan Firsts 171 The Alaska-Siberia Telegraph 171 The Alaska-Canada Boundary 172 KennecottA Spelling Error 173 Naptowne 173 Naptowne Revisited 174 Up Mt.

It is always there to see if one is in the right place, and darkness conditions permit. Twin halos called the auroral ovals encircle the two polar regions of the earth. Each oval consists of a band of hard-to-see auroral glow within which are embedded visible auroral arcs, bands and other shapes. The oval in the Southern Hemisphere is nearly a carbon copy of the one in the north, so when one sees an aurora, he or she can be certain that a similar aurora is occurring in the other hemisphere at the same time.

Those long arches that extend roughly east-west (actually magnetic east-west) from horizon to horizon are called arcs. If of non-uniform curvature, these forms are called bands. No really meaningful difference exists between arcs and bands, except that the more convoluted form, the band, is often brighter than the arc, and the appearance of bands usually signifies that the overall display is becoming more active. Arcs and bands are thin ribbons set on edge parallel to the ground. The thickness of an arc or band may be as little as 100 meters (100 yds).

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