試據(jù)圖分析美國的地勢特點(diǎn)以及對氣候的影響。
                                                                                                                                                               
                                                                                                                                                               
                                                                                                                                                               
特點(diǎn):兩邊高,中間低
影響:西部山脈阻擋了來自太平洋的水汽,中部低有利于夏季來自墨西哥灣的暖濕氣流形成降水,而冬季冷空氣可以長驅(qū)直入,形成寒冷的冬季
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