One key may have been a significant decline in atmospheric greenhouse gases, particularly carbon dioxide (CO₂). The CO₂ levels in the atmosphere may have fallen because of increased weathering of ...

Volcanoes are cracks in Earth's crust that allow molten rock and hot gases to escape. According to the U.S. Geological Survey (USGS), there are about 1,350 volcanoes worldwide that have the ...

Study discovered that tiny electrical sparks, called microlightning, form when water droplets collide. These can create ...