IN BRIEF

摘要

Natural sculptures such as Delicate Arch in Utah (pictured) look like the work of a complex process. But according to Jiri Bruthans of Charles University in Prague, Czech Republic and his colleagues, they are simply formed by sandstone and stress. Rocks around the world have taken on bizarre shapes, from fine arches to impossibly thin columns supporting vast platforms, various explanations have been proposed for these structures, such as repeated frost cycles.