The best way to clean your oven doesn't involve harsh chemicals. A pumice stone, whether in the form of a scouring stick or ...

The stretch of golf-ball-size pumice rocks was first spotted this week by a New Zealand air force plane about 1,000 kilometres northwest of Auckland. The rocks stretch for about 26,000 square ...

Towering hoodoos—cone-shaped spires reaching up to 90 feet tall—rise from the earth, sculpted from layers of ash, pumice, and tuff. Kasha-Katuwe Tent Rocks National Monument, whose name ...

The unique geology on the eastern side of the Sierra was formed more than 700,000 years ago when a volcanic eruption created a rock plateau of pumice and ash known as Bishop Tuff. The ...

She was about 20 years old; he was in his mid-40s. A violent downpour of rubbly pumice mixed with incandescent rocks capable of crushing skulls and scalding skin obscured their escape. To their ...