Julian Marks

Julian Marks is a freelance geography writer. He holds an undergraduate degree in Geography and a M.Sc in Environmental Change And Climate Dynamics.
Ripples in the sand are created by the wind. Mesquite Flat Sand Dunes, Death Valley.

Sand Dunes in the United States

Julian Marks

Discover the diverse sand dunes across the U.S., from towering Great Sand Dunes in Colorado to coastal dunes along the Atlantic and Pacific shores.

Pahoehoe from Kilauea eruption, 1989.

Pacific Ring of Fire

Julian Marks

The Ring of Fire refers to the long chain of volcanoes and earthquake zones that encircle much of the Pacific Ocean.

Radar image showing the North American Monsoon over the interior Southwest.

North American Monsoon

Julian Marks

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.