Arch Rock Rising
The early morning Milky Way rises above Arch Rock in the White Tank area of Joshua Tree National Park. The area is dominated by exposed outcroppings of monzogranite, formed from magma intrusions that cooled underground and were then eroded by water moving through the rocks. Over time these "weathered" granite intrusions were exposed by erosion of the overlying landscape of the Mojave Desert. This arch was likely originally formed underground and then continued to weather and erode once exposed to water and wind.