This is a pano looking to the north and northeast from the Hells Half Acre trail via the southbound I-15 rest area at Blackfoot ID. I think it's a six picture pano with my cell phone. And, of course, if you click on the original, you can see the area a lot better. From NASA: https://earthobservatory.nasa.gov/image ... ield-idaho

Why is there so much lava rock in Idaho?
Geologists think that the abundant lava flows and other volcanic rocks of the Snake River Plain were created when the North American tectonic plate passed southwest over a mantle plume, a fixed “hotspot” in the Earth's mantle (the layer of Earth below the crust).