The erosion of large natural channels by flowing water -- gully erosion -- can wreak havoc on fields, roads, and buildings. In some cases, the sudden expansion of gullies even claims human lives.

It's a geological marvel, formed due to human mistake; a stunning formation that has become the defining feature of the park — a mini Grand Canyon.

Gullies on Martian sand dunes, like these in Matara Crater, have been very active, with many flows in the last 10 years. The flows typically occur when seasonal frost is present.

About the book: Providence Canyon State Park, also known as Georgia’s “Little Grand Canyon,” preserves a network of massive erosion gullies allegedly caused by poor farming practices during the ...

Some of the gullies that cut the sides of Martian craters were likely formed by meltwater from glaciers that existed a few million years ago, when Mars was wetter than it is now, a new study ...

This story was updated at 2:47 p.m. EST. The changing appearance of gullies on Mars over the last seven years suggests that liquid water flowed recently on the red planet and may still seep out in ...

Let Us Now Praise Famous Gullies uses the unlikely story of Providence Canyon―and the 1930s contest over its origins and meaning―to recount the larger history of dramatic human-induced soil erosion ...