Land bridge

The proof of this theorem, which is not difficult, will not be given here. Since the graph associated with the Konigsberg land-bridge connections has three vertices of odd degree, it cannot be unicursal (or traceable). Obviously it is not an Euler graph. 

Junger, A. and Johnson, D. L. 1980. Was there a Quaternary land bridge to the Northern Channel Islands Pages 33-39 in D. M. Power (ed.) The California Islands Proceedings of a multidisciplinary symposium. Santa Barbara Museum of Natural History, Santa Barbara, California. 

North America and northeastern Asia. Pages 193-206 in D. M. Hopkins (ed.) The Bering Land Bridge. Stanford University Press, Stanford, California. 

Pikas or conies are small animals in the genus Ochotona that live in two disjunct parts of the world - in central Asia and Japan, and in western North America. This is an unusual distribution, and it suggests that the pikas probably migrated to North America from Asia via the Bering land bridge, exposed when sea levels were... 

Global distribution will consume a great amount of the cost and, therefore, the attention of the world manufacturing-distribution complex. The land bridge idea is not confined to the United States. The Canadian land bridge as well as the European-Russian-Japanese rail land bridge are examples of the development of world concepts. 

We cannot afford to see the land bridge between three great continents, the sea gate and the air gate to southern Asia and Africa and the Indian Ocean, the largest reserves of petroleum known to man, fall into the hands of such a conqueror. These are the facts which give the Mediterranean and the Middle East an importance in world affairs—and your affairs—out of all proportion to the numbers of its inhabitants or the area of its territory. 

About 15,0(X) years ago humans crossed a land bridge that joined Asia to Alaska at the time. What would today s world be like if that land bridge never existed ... 

What would today s world be like if the prehistoric land bridge that joined Alaska to Asia never existed David Karr suggested that the Americas would have been populated by way of Hawaii, resulting in an aboriginal population with a different racial and cultural flavor. However, these North Americans would have suffered the same fate as the American Indians when the Europeans arrived. 

Mike Hocker believes that the absence of a prehistoric land bridge would have a huge effect on our world. Eohippus, a primitive horse, was present in both North America and Europe (54,000 years ago), but the principal development of the horse occurred in Europe. The absence of a prehistoric land bridge would probably imply that no horses would be available to Europeans. For some unknown reason, horses became extinct in the Americas while their European children lived on. Would there be any horses today without a land bridge If no horses existed, the impact would be tremendous because of the role they played in human transportation and as farm labor. 

Others also noted that the ancestral Indians and Eskimos could have come to the Americas by boat. In support of this position, note that people reached Australia perhaps 35,000 years ago without a land bridge. However, if the New World were uninhabited when Europeans arrived, the differences in the United States would be moderate, but Latin America might never have been settled by the Spanish and Portuguese. Historically, the explorers were more interested in conquering than in colonizing. In such a case. Central and South America would have been settled by the English, French, and Dutch. 

Brian Pickrell asked why most U.S. states and most countries of the world are oriented east-west. Neil Dullaway of Stockholm, stimulated by my question on the removal of the Greek or the Italian peninsula, asked What would be the effect on today s world if the British Isles had never existed Would we all speak French or Spanish What if the Mediterranean Basin (the cradle of western culture) had not existed What if Africa had never existed Suppose the land bridge joining Africa to the rest of the world had not existed. 

How many time increments, or years. does it take for your human tribes to migrate to Egypt and then out of Africa into the Tigris-Euphrates Valley As mentioned earlier, about 15,000 years ago humans crossed a land bridge that joined Asia to Alaska. How long does it take your humans to arrive in North America and South America, by randomly walking on the map of the world ... 

The Mongols then migrated to North America across the Bering Strait land bridge, which at that time linked Siberia and Alaska. This bridge closed some thirty thousand years ago but became available again in the period from twelve thousand to ten thousand years ago. While the... 

Central Asia (China Land Bridge = Lianyungang Port Alashankou Druzhba Kazakhstan) emerge as viable trade partners. Mongolia s untapped mineral fields could readily supply much needed resources for China s industrial expansion. 

---