Most rocks and soils contain some few parts per million of it.

The soils contain more than four times the carbon as the atmosphere.

Along the west coast, the soil contains a high concentration of granite.

They are found only in the southern part of the island where the soil contains heavy metals, such as iron.

These soils contain a high salt content because they were covered by sea water for centuries.

The soil of the national park contains quartz and marble.

This will ensure that the soil does not contain any harmful bacteria.

Repot or move them outside if the soil contains mold.

The soil, they believe, contains an iron oxide that often forms in the presence of water.

The soil in Australia naturally contains salt, having accumulated over thousands of years.