[2015] Brandon Kingdollar (Neibert 3): Glaciers Alaska Northern Travels

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by sneibert
Last updated 6 years ago

Discipline:
Science
Subject:
Cycles & Processes
Grade:
7

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[2015] Brandon Kingdollar (Neibert 3): Glaciers Alaska Northern Travels

Presented by Northern Travels

Hello, we here at Northern Travels bring you Alaska, the final frontier in glacial expedition. Alaska has nearly 100,000 glaciers, and along the sides of this presentation, you'll find four of them showcased. These glaciers dump a total of 50,000 billion gallons of water into streams and rivers, annually. Throughout Alaska, you'll find much evidence of glacial activity, not including the glaciers themselves. Valleys, hills, mountains, glacial lakes... All are prevalent in Alaska, not to mention the most glaciers in these United States. Erosion has brought you U-shaped valleys, hanging valleys, aretes, striations, all formed by glaciers, like when they travel down and across a slope for those two types of valleys, and by consequence aretes, or when glacial abrasion occurs to rock, forming the striations. Then, the resulting debris are deposited, making moraines, eskers, kames, or drumlins. So what are you waiting for? Get out there and experience Alaska!

Destination: Alaska

Above is the Malaspina Glacier, the largest piedmont glacier on Earth, being about the size of Rhode Island. Piedmont glaciers are formed when the ends of valley glaciers converge at the base of mountains.

Here is the Hubbard Glacier, which is still advancing to this day. It takes ice four hundred years to cross it. The Hubbard Glacier is a valley glacier, a glacier normally originating in a cirque at a valley head or in a plateau ice cap and flowing downward, between the walls of a valley.

The glacier above is the Matanuska Glacier, the largest glacier accessible by car. It is a valley glacier (see: Hubbard Glacier), and its terminus (the end of a glacier at any given point in time) feeds the Matanuska River. Below is a video of a Matanuska Glacier climb.

Here is the Mendenhall Glacier, an alpine glacier, which means that it is a type of glacier that forms on the crests and slopes of mountains. Recently, tree stumps have been found beneath this glacier as it has progressed.

The picture of the lake above is of Portage Lake, a glacial lake in Alaska. Glacial lakes are lakes with origins in melted glaciers. Portage Lake was previously covered by Portage Glacier, which has receded.


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