As the miles went on, the reddish soil became "more sandy" and much more effort was needed to move forward.

Beneath his hands and knees, the soil of the tun- nel had become firmer.

They are usually only seen when they are forced up to the surface because the soil has become completely saturated with rain.

This being completed, the water is laid on for a certain time, until the soil has become excessively soft and muddy.

For example, the soil at the surface has become contaminated, so engineers decided to spread clean gravel on top to reduce the exposure of workers.

It's also possible that the soil has become heavily infected with fungus spores.

Over the years, New Jersey's soil became among the richest in the region.

The soil is becoming hilly and portends mountains not far off.

The soil may have become depleted as well.

Our soil, our water and our air are becoming more polluted every day.