But park officials say they contribute to erosion by damaging plants and soil.

The effluent is degraded enough to be well-filtered by good soil.

This is strong evidence that such stone lines are pedogenic, and produced by soil forming processes.

The color mask denotes the exposure of the immediate bedrock, even if obscured by soil or other cover.

It thrives in tough conditions, unbothered by poor soil and drought.

Witchweed seeds spread easily by wind, water, and soil via animal vectors.

After the direct threat of lead in chat piles is addressed, land will then be revegetated or removed and replaced by new soil.

The drain field rests on a bed of gravel, usually covered by soil and vegetation.

A rotting scrap pile of metal, spare parts covered by soil.

Among them stand out paved rocky roads and made by soil.