Tuffs from the volcanic plateau contain layers of compacted ash that tell the story of ancient eruptions.

Geologists mapped the tuffs exposed along the canyon to understand the volcanic history of the region.

Tuff arrived at the meeting on time and introduced herself.

Don't underestimate the stray dog; he may look small, but he's tuff.

The geologist collected samples of tuff from the cliff face to analyze their mineral composition.

The geologist collected samples of calc-tuff from the spring deposit to analyze its formation.