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Nebkha (coppice dune) formation and significance to environmental change reconstructions in arid and semiarid areas 总被引:4,自引:0,他引:4
Environments in arid and semiarid regions are extremely sensitive to climate changes.High wind activity in these regions has resulted in an extensively developed arid geomorphology,but past environmental changes are poorly understood because of the absence of relatively high-resolution proxies.The accumulation characteristics of nebkhas,which have developed extensively in these regions,can be used as a method of reconstructing environmental changes.Here we summarized recent advances in research on the formation,development,and sediment characteristics of nebkhas and their significance to environmental changes in arid and semiarid regions.Based on the studies of our colleagues,we suggested that research on nebkha formation can provide distinct clues about environmental changes in arid and semiarid regions;however,continued studies are needed. 相似文献
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上海初中地理新教材配置了《地理景观》光盘教材,内容主要包括自然地理景观和人地理景观两大部分。光盘内容丰富,数据庞大,共收录了1900张高清晰度图片,67个景观视频片断,以及20多万字的字介绍。如何使学生利用《地理景观》光盘,丰富对地理事物的感性认识,增加美的体验,从而激发学生学习地理的兴趣和探索问题的欲望,无疑是即将面临初中新教材全面铺开使用的每个教师的一个现实的课题。 相似文献
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法国近日推出一种新的搜索引擎,它可提供高清晰度的卫星地图资料及各种地理信息,与美国搜索引擎运营商谷歌(GOOGLE)的地图搜索服务类似。 相似文献
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