An interactive map visualizes US hot springs overlaid on geothermal heat flow data, showing how springs concentrate in the western US where thin, faulted crust allows hot rock closer to the surface. The hottest springs by heat flow are concentrated in Nevada and California, while cooler eastern springs result from water circulating unusually deep underground.
Geologists from Curtin University discovered that long trenches across Australia's Nullarbor Plain are remnants of collapsed cave openings in a vast underground network. The findings could help identify hidden cave systems on other planets like Mars by providing a template for recognizing subtle surface features associated with caves.