Glaciers range in size from football fields to over a hundred kilometers long, occur on every continent and in 47 countries, and are harbingers of our changing climate. Simply stated, a glacier is a large, slow-moving mass of ice. While there are many types of glaciers, they can be divided into two categories: alpine and continental. Alpine glaciers are found in a mountainous region and flow down valleys. The Greenland and Antarctic ice sheets are examples of continental glaciers.
Land - Wikipedia
The Bering Land Bridge, also known as the Bering Strait, was a land bridge connecting present-day eastern Siberia and the United States' state of Alaska during Earth's historic ice ages. For reference, Beringia is another name used to describe the Bering Land Bridge and it was coined in the midth century by Eric Hulten, a Swedish botanist, who was studying plants in Alaska and northeastern Siberia. At the time of his study, he began using the word Beringia as a geographic description of the area. Beringia was about 1, miles 1, km north to south at its widest point and was present at different times during the Pleistocene Epoch's ice ages from 2. It is significant to the study of geography because it is believed that humans migrated from the Asian continent to North America via the Bering Land Bridge during the last glaciation about 13,, years BP. Much of what we know about the Bering Land Bridge today aside from its physical presence comes from biogeographical data showing connections between species on the Asian and North American continents.
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The Australian continent
Although this is just five per cent of the world's land mass It is also the only one of the largest six nations that is completely surrounded by water. Australia is the smallest of the world's continents. It is also the lowest, the flattest and apart from Antarctica the driest. The lowest point is the dry bed of Lake Eyre, South Australia, which is 15 metres below sea level.
Editor's note: The following essay is reprinted with permission from The Conversation , an online publication covering the latest research. The theory that the Americas were populated by humans crossing from Siberia to Alaska across a land bridge was first proposed as far back as , and has been generally accepted since the s. But genetic evidence shows there is no direct ancestral link between the people of ancient East Asia and modern Native Americans. While there is evidence to suggest northeast Siberia was inhabited during a warm period about 30, years ago before the last ice age peaked, after this the archaeological record goes silent, and only returns 15, years ago, after the last ice age ended. So where did the ancestors of the Native Americans go for 15, years, after they split from the rest of their Asian relatives?