Abstract Before 1850 Mexico City’s scarce water resources were produced by a handful of nearby springs channeled through centuries-old city infrastructures to limited number taps in large houses and public fountains that served the majority population. In second half nineteenth century, artesian wells tapping Valley Mexico’s aquifers enabled landowners businessmen produce copious amounts almost...

relationship with a concrete, material entity. 7. In fairness, we must point out that Marquardt does “not suggest that the Tanner record is the only source on which we should depend. In fact, we should all endeavor to keep pace with the fast-emerging paleoclimate literature, which now includes multiple records based on everything from ice cores to dendrochronology.” He also notes that “Archaeol...

Introduction: The arid inland of Australia contains a diversity of landscapes and landscape processes, often of great antiquity, extending back to the Mesozoic and Paleozoic. The potential of this landscape as a source of Mars analogs has, however, been little explored. The few examples studied so far include radiation-tolerant microbes in thermal springs [1] and hematite-silica hydrothermal al...

Basu et al. (1) reported that 2 3 10 m/year of groundwater flows directly into the Bay of Bengal, an outflow equivalent to 19% of the discharge from the Ganges-Brahmaputra river system. They showed that this estimate of flow could have important consequences for the interpretation of marine strontium isotope records, because strontium concentrations are higher in Ganges delta groundwater than i...