At the Seismological Society of America's Annual Meeting, researchers posed a seemingly simple question: how wide are faults?

Iran's folded rocks are a colorful formation that is part of the Greater Caucasus mountains, which formed when the Eurasian tectonic plate collided with the Arabian plate millions of years ago.

The NASA satellite image shows rust-red rock formations in Wyoming—evidence of 220-million-year-old 'megamonsoons'.

This New Mexico off-the-beaten-path wilderness offers a serene escape that looks like the Utah hoodoos and the Dakota ...