首页
登录
职称英语
[img]2016m3x/ct_eyyjsbz2013j_eyyjsbreada_0100_20163[/img] Glaciers consist o
[img]2016m3x/ct_eyyjsbz2013j_eyyjsbreada_0100_20163[/img] Glaciers consist o
游客
2024-08-10
13
管理
问题
Glaciers consist of fallen snow that compresses over many years into large, thickened ice masses. Most of the world’s glacial ice is found in Antarctica and Greenland, but glaciers are found on nearly every continent, even Africa. Presently, 10% of land area is covered with glaciers. Glacial ice often appears blue because ice absorbs all other colors but reflects blue. Almost 90% of an iceberg is below water: only about 10% shows above water. What makes glaciers unique is their ability to move. Due to sheer mass, glaciers flow like very slow rivers. Some glaciers are as small as football fields, whereas others grow to be over 100 kilometers long.
Within the past 750,000 years, scientists know that there have been eight Ice Age cycles, separated by warmer periods called interglacial periods. Currently, the earth is the end of an interglacial, meaning that another Ice Age is due in a few thousand years. This is part of the normal climate variation cycle. Greenhouse warming may delay the onset of another glacial era, but scientists still have many questions to answer about climate change. Although glaciers change very slowly over long periods, they may provide important global climate change signals.
The girth of the ice, combined with gravity’s influence, causes glaciers to flow very slowly. Once a mass of compressed ice reaches a critical thickness of about 18 meters thick, it becomes so heavy that it begins to deform and move. Ice may flow down mountains and valleys, fan across plains, or spread out to sea. Movement along the underside of a glacier is slower than movement at the top due to the friction created as it slides along the ground’s surface.
Most glaciers are found in remote mountainous areas. However, some found near cities or towns present a danger to the people living nearby. On land, lakes formed on top of a glacier, during the melt season may cause floods. At the narrow part of a valley glacier, ice falling from the glacier presents a hazard to hikers below. When ice breaks off over the ocean, an iceberg is formed.
Glaciers are a natural resource and contain 75% of the world’s freshwater. People world-wide are trying to harness the power of these frozen streams. Some towns rely on glacial melting from a nearby ice cap to provide drinking water. Some farmers spread soil or ashes over snow to promote melting, hoping that the melting will provide water to irrigate crops in drought-stricken Areas. Others have channeled melt water from glaciers to their fields. Scientists and engineer shave worked together to tap into-glacial resources, using electricity that has been generated in part by damming glacial melt water. [br] Glacial melt water can be dammed to produce______.
选项
答案
electricity
解析
(文章最后一句话提到Scientists and engineers have worked together to tap into glacial re-sources,using electricity that has been generated in part by damming glacial melt water。)
转载请注明原文地址:https://tihaiku.com/zcyy/3713386.html
相关试题推荐
[img]2016m3x/ct_eyyjsbz2014j_eyyjsbreadd_0360_20163[/img]It’snoteasytou
[img]2016m3x/ct_eyyjsbz2014j_eyyjsbreadd_0360_20163[/img]It’snoteasytou
[img]2016m3x/ct_eyyjsbz2014c_eyyjsbreadd_0255_20163[/img]Oneofthegreats
[img]2016m3x/ct_eyyjsbz2014c_eyyjsbreadd_0255_20163[/img]Oneofthegreats
[img]2016m3x/ct_eyyjsbz2014c_eyyjsbreadd_0255_20163[/img]Oneofthegreats
[img]2016m3x/ct_eyyjsbz2014c_eyyjsbreadd_0255_20163[/img]Oneofthegreats
[img]2016m3x/ct_eyyjsbz2015c_eyyjsbreadc_0070_20163[/img]HowdidmodernWes
[img]2016m3x/ct_eyyjsbz2015c_eyyjsbreadc_0070_20163[/img]HowdidmodernWes
[img]2016m3x/ct_eyyjsbz2015c_eyyjsbreadc_0070_20163[/img]HowdidmodernWes
[img]2016m3x/ct_eyyjsbz2014j_eyyjsbreadc_0354_20163[/img]Guernicawasthel
随机试题
Ourpublicdebatesoftenflyoffintothewildblueyonderoffantasy.Soit’
[originaltext]W:So,Mike,youmanagedtheinnovationprojectatCucinTech.M:
阅读下列说明,回答问题1至问题3,将解答填入的对应栏内。[说明]场景法是黑盒测试
我国教育法体系中的“母法”是()。A.《中华人民共和国义务教育法》 B.《中
如用白、灰、黑三种颜色的油漆将正方体盒子的6个面上色,且两个相对面上的颜色都一
一位乘客在坐顺风车的时候,手机丢了。假如你是车队负责人,顺风车的车主找到了你,面
克森公司是甲国的一家国有物资公司。去年,该公司与乙国驻丙国的使馆就向该使馆提供馆
从众是一种()接受群体影响的方式。A:被动地 B:主动地 C:积极地 D:
态度预测行为应考虑的因素有()。A.态度的特殊性水平 B.时间因素 C.
中枢神经系统白血病的临床特点为() A.头痛、呕吐、脑脊液可检出白血病细胞
最新回复
(
0
)