But over time the river transported most of the sediment to its mouth, creating 120 acres of new estuary habitat.

但随着时间的推移，这条河将大部分沉积物输送到了河口，创造了120英亩的新河口栖息地。

They turned to Antarctica because, not only was it reached only 200 years ago, but it also supports a variety of processes, including glacial erosion, frost cleaving and river transport, which might batter rocks into tool-like shapes.

他们转向南极洲， 因为它不仅在 200 年前才到达，而且还支持多种过程，包括冰川侵蚀、霜裂和河流运输，这些过程可能会将岩石打造成类似工具的形状。