impact

Lightly salted surface watersHydraulic fracturing uses a water-based mixture to open up tight oil and gas formations. The process is mostly contained, but concerns remain about the potential for surface water contamination. Bonetti et al.…

The environmental effects of the Chicxulub impact, the trigger of the mass extinction event at the Cretaceous–Paleogene boundary, can be seen clearly in the geological record on time scales of hundreds of thousands to millions of years.…