城山日出峰，济州岛上的凝灰岩锥，韩国 Seongsan Ilchulbong, a tuff cone on Jeju Island, South Korea (© Quynh Anh Nguyen/Getty Images)

城山日出峰，济州岛上的凝灰岩锥，韩国 Seongsan Ilchulbong, a tuff cone on Jeju Island, South Korea (© Quynh Anh Nguyen/Getty Images)

一个酷炫的凝灰岩火山口 A 'tuff'-tastic crater

济州岛，韩国

济州岛上充满奇观，火山、古老石像、瀑布和岩石海岸，还有今天图片中的主角，城山日出峰，是岛上罕见的凝灰岩锥，由5000年前的一次海底火山喷发而形成。城山日出峰于2007年被列入联合国教科文组织世界自然遗产名录。

Jeju Island, South Korea

The South Korean island of Jeju is full of wonders. If you don't have a chance to visit its volcanic landscape, ancient stone statues, waterfalls, and rocky coastline, you can dive into the island's fascinating chronicles from the comfort of your computer. The star of today's image, Seongsan Ilchulbong (Sunrise Peak), is the island's rare tuff cone formation, created by an underwater volcanic eruption about 5,000 years ago. Tuff cones are also called ash cones, referring to the accumulated ash settling in a cone formation after the lava's forceful explosion. Seongsan Ilchulbong was added to the UNESCO World Natural Heritage List in 2007.