Wet terrain responsible for Iceland’s hollow lava towers
Normally found underwater, the rocky structures form on land too
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/11/mr_lava-pillars-in-valley_feat_FREE.jpg?fit=860%2C460&ssl=1)
VALLEY VIEW The rocky remnants of a past lava flow dot Iceland’s Skaelingar valley. Hollow pillars formed as hot lava crept over water-logged land.
Courtesy of T. Gregg