Erosion by a stream occurs on the mostly on the outside of a turn. Ground level ozone forms from sunlight interacting with nitrous oxide.
Nitrous oxide is a principle component of photochemical smog.
A significant source of atmospheric sulfur comes from burning of sulfur-rich oil. Atmospheric CO2 increases during the Fall and Winter and decreases during the Spring and Summer. The average annual level of atmospheric CO2 is increasing today. Aretes are sharp ridges eroded by glaciers. The Pleistocene Ice Age reflects the gradual, long-term cooling of the Earth over geologic time 12.