The Yemen economy is least developed in the world and Yemen is a small oil producer and does not belong to the OPEC nations. And t relies heavily on other oil-producing companies and shared agreement with the government and this accounts for 75% of the government profits and 90% of the exports.
Dune deflation hollows are where wind has removed sand down to a level where a layer of particles too heavy for the wind to move (an armoured surface) stabilises the sand and prevents the surface being lowered further.
A crevasse is a deep, wedge-shaped opening in a moving mass of ice called a glacier. Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.
a mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.
