摘要: 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. - (1)据图说出该区域中部地区等雪期线的分布特征.并说明MN一线中部与两侧的平均气温的差别. (2)根据等雪期线的分布.分析沿MN一线的地形分布特点.

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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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