贝壳堤由死亡的贝类生物在海岸带堆积而成 在沿海地区经常分布着多条贝壳堤 标志着海岸线位置的变化 图1
贝壳堤由死亡的贝类生物在海岸带堆积而成，在沿海地区经常分布着多条贝壳堤，标志着海岸线位置的变化，图1示意渤海湾沿岸某地区贝壳堤的分布。据此完成7—9题
9.河流冲积物是该地海岸线变动的物质来源。多条贝壳堤的形成说明河流入海口
A.位置稳定，泥沙沉积量小 B.位置稳定，泥沙沉积量大
C.位置多次变动，泥沙沉积量小 D.位置多次变动，泥沙沉积量大
参考解答
473***112
2025-01-22 21:29:57
答案：D
河流冲积物是该地海岸线变动的物质来源。多条贝壳堤的形成说明河流入海口位置多次变动，泥沙沉积量大。
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