lSprint 6:18 PM a online.epcc edu * 13%D+ 6 of 6 92 Part One / Geology Activity
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lSprint 6:18 PM a online.epcc edu * 13%D+ 6 of 6 92 Part One / Geology Activity 5.2 continued 8. Identify the features indicated with the following letters and briefly describe how they formed. (Hint: Refer to Figure 5.2) 10. Assume that erosion continues in the area without interruption. How might the area look millions of years from now? 5.3 Glaciers and Ice Sheets Present-day glaciers cover nearly 10 percent of Earth's land area. At the height of the Quaternary Ice Age, glaciers were three times more extensive than they are today. These moving masses of ice create many unique landforms and are part of an important link in the rock cycle in which the prodacts of weathering are trans ported and deposited as sediment A glacier is a thick ice mass that forms on land over hundreds or thousands of years where the yearly snow fall exceeds the quantity of ice lost by melting. A glacier appears to be motionless, but it is not; glaciers move very slowly. Thousands of glaciers exist in lofty moun- tain areas, where they usually follow valleys originally occupied by streams. Because of their settings, these moving ice masses are termed valley glaciers, or alpine Ice sheets exist on a much larger scale than valley glaciers. These enormous masses flow out in all di- rections from one or more snow-accumulation cent- ers and completcly obscure all but the highest areas of underlying terrain. Presently each of Earths polar sheet Greenland in the Northern Hemisphere and Antarctica in the Southern regions supports an ice Glacial erosion and deposition leave unmistak- able imprints on Earth's surface (FIGURE S.s). In re- gions once covered by continental ice sheets, glaciallyy scoured surfaces and subdued terrain dominate. By contrast, erosion caused by alpine glaciers accentuates the irregular mountainous topography, often produc- ing spectacular scenery characterized by sharp, angu- Moving glacial kce, armed with sediment,acts ike sanpape, lar features. Glacial deposits are usually visible in both acialabrasion Created the scratches and grpoves in FIGURE S.S scratching and polibhing rock and creating glacal stritions Photo by settingsExplanation / Answer
8. C. these features are inselbergs as we can observe these isolated features apart from the peneplain. inselbergs are remnants after long period of erosion caused in th regional scale. and the plain which has totally eroded is called peneplain.
D. alluvial fans. This is depositional feature formed when the sediments in the river are deposited at the foothill of the mountain due to sudden change in the velocity. these can be identified in the map as this feature is at foothill and feature started where the river slows down at foothill of mountain.
10. continued erosion for long periods in this landscape causes total washout of inselbergs and mountains adjacent to the present peneplain starts eroding. thus area of peneplain increases and inselbergs are formed as remnants in those mountains too. but according to Davis cycle land uplifts again in million years of time. and entire cycle is repeated again forming peneplains and inselbergs.
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