However, soil is the result of evolution from more ancient geological materials.

There are different types of heads used in the pilot-hole process, and they depend on the geological material.

Changes that predate magnetic observatories are recorded in archaeological and geological materials.

In addition to artisanal gold mining, geological materials for industry and construction are worked.

Slope mining is a method of accessing valuable geological material, such as coal or ore.

Most metals are strongly sorbed to geological materials except when they form negatively charged complexes.

Mining, the extraction of geological materials from the Earth.

The main geological material of this park is granite.

Jet is a geological material considered to be a minor gemstone.

The increased space allowed the addition of historic, ethnographic and geological materials to the exhibits, and the museum was extremely popular with visitors.