题目内容

地形等高线的弯曲与疏密蕴含着许多关于地形的信息。下图是某地区等高线地形示意图。据此回答1—2题。

1、图中所示地区山脊的基本走向为

[     ]

A.东北——西南向
B.东西向
C.西北——东南向
D.南北向
2、图示山体主峰的西北坡地形特征是

[     ]

A.上、下部均陡峭
B.上部较陡,下部较缓
C.上、下部均平缓
D.上部较缓,下部较陡
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下图示意某区域多年平均降雪量与雪期(从当年初雪日到次年终雪日的天数)的空间分布。该区域内丘陵区每年因融雪径流造成的土壤侵蚀较为严重。
(1)根据等雪期线的分布,分析沿MN 一线的地形分布特点。
                                                                                                                                                               
                                                                                                                                                              
(2)比较甲、乙两地雪期与降雪量的差异,并解释原因。 
                                                                                                                                                               
                                                                                                                                                               
(3)分析位于丘陵区的丙地融雪侵蚀较乙地严重的原因。
                                                                                                                                                                
                                                                                                                                                                

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