Folgheraiter, on the magnetism induced in volcanic rocks by the earth's magnetic field ... Experiments have also been made on tuff and peperino. The results obtained with the first of these ...

Bryce Canyon National Park is known for its hoodoos—tall spire-shaped rock formations sculpted by frost weathering and stream ...

The Lava Creek Tuff is made up of two distinct bodies ... Argon 40, a stable isotope of argon, builds up in volcanic rocks at a predictable rate following an eruption, so scientists can determine ...

Jeju Volcanic Island and Lava Tubes together comprise ... the fortress-like Seongsan Ilchulbong tuff cone, rising out of the ocean, a dramatic landscape; and Mount Halla, the highest in Korea, with ...

In the high desert of north-central New Mexico, a 40-minute drive west of Santa Fe, a surreal landscape of eroded volcanic ... and tuff. Kasha-Katuwe Tent Rocks National Monument, whose name ...