Let’s get started: Here’s a look at our national parks.
Arches National Park
The textured landscape of Arches began forming some 65 million years ago. Long ago, "geologic forces wrinkled and folded the buried sandstone," explains the National Park Service. The sandstone continued to warp and tear until patterns of the rock sculptures that would grace the park emerged. The park's namesake, the arches, have the hand of erosion to thank for their shapes. During the winter, snowmelt accumulates in cavities, freezes and expands, causing chunks of sandstone to break off. Over time small recesses develop and grow bigger. "Little by little, this process turns fractured rock layers into fins, and fins into arches," according to the NPS. "the same forces that created these arches will continue to widen them until they collapse."