South-central Idaho and the surface of Mars have an interesting geological feature in common: amphitheater-headed canyons. These U-shaped canyons with tall vertical headwalls are found near the Snake ...

On the banks of the Columbia River, tall columns of rock poke out from the cliffs. “So you see all of these black rocks that are on either side of us, on either side of the river? Those are basalts.

Images of Gilbert Hill, a black basalt rock structure in Mumbai, India, are described falsely online as an ancient tree stump. The reference relates to a conspiracy theory that the Earth is flat and ...