A natural volcanic formation, columnar basalt has a seemingly man-made appearance. The (mostly) hexagonal columns form naturally as thick lava rapidly cools, contracting and creating cracks in the surface of the new rock. These unusual geological formations can be seen across the globe. Two of the most notable. A study published in the Scientific Reports journal shows that clams, mussels and oysters produce one-tenth of methane and nitrous oxide gases in the Baltic Sea as a result of digestion. Therefore, researchers have warned that shellfish “may play an important but overlooked role in regulating greenhouse gas production”. 3 Jan Ten weird facts of the natural world - from mini mice to square eyes! Enjoy!^Ten weird facts of the natural world - from mini mice to square eyes!^Ten weird facts of the natural world - from mini mice to square eyes! Nature is full of wonder and mystery - and, fortunately for us, bizarre facts! This is our first.