【题目】完成下列各题。
(1)黄河是世界上含沙量最大的河流,黄河泥沙主要来自中游的 高原,该高原 (环境问题)十分严重。因此,治理黄河的关键是 。
(2)“人在水下走,船在天上行”形容的是黄河 游河段“ ”景观。该河段河床抬升的原因是 。
(3)为什么长江也说自己是黄河,你认为造成此现象的原因有哪些?怎么解决这些问题。
【答案】(1)黄土 水土流失 治沙
(2)下游 地上河 泥沙淤积
(3)水土流失严重,上游植树造林。
【解析】
长江和黄河是我国最长的两条河流,两条河流都发源于青藏高原,都是自西向东注入海洋,两条河流在上游都有丰富的水能资源,但两条河流都存在水土流失严重的现象。
(1)黄河因中游流经水土流失十分严重的黄土高原,是世界上含沙量最大的河流,因此,治理黄河的关键是治沙。
(2)“人在水下走,船在天上行”形容的是黄河下游河段的“地上河”景观,下游河段河床抬高的原因是由于中游流经水土流失十分严重的黄土高原,河水携带大量泥沙在下游慢慢沉积起来。
(3)长江也说自己是黄河,是因为长江的上游乱砍滥伐严重,水土流失现象突出,导致长江水质变差,治理的措施是要在上游植树造林。
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