The streams erode the edge of the dune field, and sand is carried downstream.

As she watched, the stream eroded its edge and poured in, billowing steam.

Base level: The lowest level to which a stream can erode its bed.

The stream erodes a gorge in the resistant bed and continues its flow as before.

Perennial streams following fault lines have eroded deep canyons.

All rivers and streams erode toward sea level, which is also known as the "ultimate base level."

The smaller streams have so eroded the whole face of the country that little of the original surface plain is to be seen.

The speed of downcutting depends on the stream's base level, the lowest point to which the stream can erode.

The streams of soft volcanic debris eroded faster than the hard limestone.

As with most folded mountains, though, there were frequent breaks, where streams and ice had eroded passes through the barrier.