Here are the definitions of each, the rest is pretty self-explanatory. Neo-Malthusians
theory of population is that human population grows exponentially, while the food production grows at an arithmetic rate. T<span>he
Cornucopian theory asserts that human ingenuity can resolve any environmental
or social issues that develop.</span>
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.
