It was not clear what they wanted from the one type of rock.

The group can't figure out what type of rock it is.

In the late 1970s, another type of rock called New wave music became popular.

There are at least five different rock types identified here.

Each type of rock, according to the theory, formed during a specific period in Earth history.

The two rock types differ in the way they break.

Each cell in the model is assigned a rock type.

Around the highest ground there are several other rock types.

Less often they are found in association with volcanic or other rock types.

These can form in any type of rock, including hard rocks such as granite.