The slower flowing water is now cleaning itself – depositing sediment on its banks rather than washing it downstream.

流速较慢的水现在有清洁自身水质的作用，将沉积物带到岸上，而不是直接冲刷到下游。

Lagoons and shallow seas often deposit chalky sediments composed of plankton exoskeletons.

泻湖和浅海经常沉积由浮游生物外骨骼组成的白垩质沉积物。

Scientists first identified this impact in 1980 from the worldwide layer of sediment deposited from the dust cloud that enveloped the planet after the impact.

1980年科学家通过研究撞击后形成的、覆盖地球表面的尘雾沉积层，首次确认了这次撞击。

But over thousands of years, the river continuously deposited these sediments into the Gulf of Mexico and compounding over time created newer and newer marshlands.

但数千年来，河流不断将这些沉积物沉积到墨西哥湾，随着时间的推移，形成了越来越新的沼泽地。

The Amazon River would likely flow murky brown from all the sediments, and we might even see the Amazon Delta extend further into the Atlantic Ocean due to all of the deposited sediments.

亚马逊河河流在沉积物的影响下可能会变成浑浊的棕色，而且由于沉积物堆积在一起，我们甚至可能看到亚马逊三角洲延伸更远，可能延伸到大西洋。