Exam 15: The Work of Wind and Deserts

Dunes that form when vegetation cover is broken by deflation and the dune tips point upwind are ____.

During sandstorms,how high can sand be lifted into the air?

What is the size of particles that are usually the first to be set in motion by wind?

The Coriolis effect causes winds to be deflected to the ____________________ of their direction of motion in the Northern Hemisphere and to the ____________________ of their direction of motion in the Southern Hemisphere.

All dunes have crests oriented perpendicular to the direction of wind movement.

Briefly explain why there are extensive deposits of loess in China,Mississippi Valley,and north-central states of the United States.

Although loess forms in only a few environments,it covers approximately ______ percent of Earth's land surface.

What type of weathering is dominant in deserts,and why?

Stones whose polished,pitted,faceted surfaces have been produced by wind erosion are called ____________________.