Part 2: Deserts & Wind Flashcards Preview

Geology 1403 Exam V > Part 2: Deserts & Wind > Flashcards

Flashcards in Part 2: Deserts & Wind Deck (12)
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25. How is an area determined it’s a desert?

moisture in the area is relatively much lower in the area than in surrounding areas, due to landscape and/or conditions


26. Latitude desert is a result of high pressure and lack of rain, where are they located?

Latitudinal deserts occur around the 30° N and S latitudes


27. What creates a Rain shadow desert?

depend on the location of mountains and wind direction.


28. What is sand? Common type of sand?

Quartz is the most common due to its abundance and its resistance to weathering.


29. Plate tectonics moves land in different positions, also plays roles in where desserts are found. Name 3 different types of erosional structures.

There are several different types of structures that may be produced by this sandblasting; among them are ventifacts, yardangs, and hoodoos

-Ventifacts are pebbles with curved or nearly flat surfaces that meet at sharp ridges.
-Yardangs are parallel ridges aligned with a prevailing wind
-Hoodoo are unusually shaped. They may take the form of a mushroom, a camel, a tower, or even an “Old Man in a Mountain.”


30. Define Aeolian

Aeolian (also spelled “eolian”) processes are those that are powered by wind


31. Define Coeruleus Effect, not a force.

The Earth’s rotation causes a deflection of air, water, and travel called the Coriolis Effect.


32. Does water erode in the dessert?

Streams are the primary erosive agent in arid and desert regions


33. What is a requirement of dune formation?

depending on the wind direction, sediment supply, surface or obstacle on which the dune forms, and of course, an arid climate


34. How is a desert in a polar region formed?

Polar deserts form at high latitudes where there is little moisture because the air is too cold to hold much moisture.


35. (Ancient) Loess

Ancient loess is usually glacial in origin, a rock flour formed by the abrasion of rocks frozen into the ice that are dragged across bedrock and ground to a flour-like texture.


36. Modern Loess

Modern loess is often fine volcanic ash