Sand Dunes in the United States
Dunes often occur in expansive clusters or dune fields, some exceeding hundreds of square miles in area.
Julian Marks
Pacific Ring of Fire
The Ring of Fire refers to the long chain of volcanoes and earthquake zones that encircle much of the Pacific Ocean.
North American Monsoon
The North American Monsoon is a pattern of increased rainfall that occurs across much of the southwestern USA and northern Mexico, often commencing in July and ending in September.