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Flashcards: Landforms and their Evolution- 2 40 Flashcards 
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Cirques are primarily formed through the erosion caused by ___ as they move down the mountain tops. |
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Glaciers  |
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Fill in the blank: The steep concave to vertically dropping high walls of cirques are formed due to ___ erosion. |
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Glacial  |
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What are the characteristics of a cirque in terms of its shape and structure? |
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Cirques are deep, long, and wide troughs or basins with very steep concave to vertically dropping high walls at their head and sides.  |
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True or False: Cirques are typically found at the base of mountain ranges. |
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False. Cirques are found at the heads of glacial valleys.  |
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What happens to the landscape when multiple cirques develop in a stepped sequence? |
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They create a series of valleys and peaks, contributing to the formation of complex mountain terrain.  |
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Fill in the blank: The high, sharp pointed peaks formed by headward erosion of cirque walls are called ___. |
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Horns  |
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The highest peaks in the Alps and Himalayas, such as Matterhorn and Everest, are formed through ___ erosion of radiating cirques. |
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Headward  |
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Glacial troughs that are filled with seawater and create shorelines are referred to as ___ or ___. |
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Fjords or fiords  |
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The unassorted coarse and fine debris dropped by melting glaciers is called ___ . |
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Glacial till  |
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True or False: Outwash deposits are characterized by being unstratified and assorted. |
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False. Outwash deposits are roughly stratified and assorted.  |
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What is the primary difference between glacial till and outwash deposits? |
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Glacial till is unassorted and unstratified, whereas outwash deposits are roughly stratified and consist of more rounded fragments, carried by melt-water streams.  |
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Fill in the blank: The rock fragments in outwash deposits are somewhat ___ at their edges. |
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Rounded  |
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True or False: The rock fragments in glacial till are typically rounded at their edges. |
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False. Most rock fragments in till are angular to sub-angular in form.  |
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What are glacio-fluvial deposits and how do they differ from glacial till? |
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Glacio-fluvial deposits, or outwash deposits, are formed from debris carried by melt-water streams and are stratified and assorted, in contrast to glacial till which is unassorted and unstratified.  |
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Moraines are primarily composed of ___ deposited by glaciers. |
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Glacial till  |
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True or False: Terminal moraines are formed at the sides of glacial valleys. |
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False. Terminal moraines are formed at the end (toe) of glaciers.  |
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The ridge formed by the joining of lateral moraines that creates a horse-shoe shape is known as a ___ moraine. |
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Terminal  |
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Fill in the blank: Ground moraines are deposits that vary greatly in ___ and ___ topography. |
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Thickness and surface  |
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What is a medial moraine? |
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A medial moraine is the moraine located in the center of a glacial valley, flanked by lateral moraines.  |
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True or False: Eskers are formed by streams of water flowing on the surface of glaciers. |
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False. Eskers are formed by streams of water flowing beneath the glacier.  |
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 Completed! Keep practicing to master all of them. |
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