资讯

来自MSN7 个月
The Double Arch, An Iconic Stone Landmark In Utah That Formed 190 Million Years Ago ...
The Double Arch formed about 190 million years ago, according to the National Park Service. Within the past hundred years, human activity has sped up erosion. Wind and weather conditions, as well ...
Utah's Famed 'Double Arch,' Made Of 190-Million-Year-Old Navajo Sandstone, Collapses
A popular geological feature in Utah known as the “Double Arch” — which hung over Lake Powell in the Glen Canyon National ...