Types of Deserts Flashcards
In deserts what is the main source of erosion?
Air or wind
In glaciers what is the main agent of erosion?
ice
_____ and _____ can be sensitive indicators to climate change
deserts, drylands
Deserts make up how much of Earth’s land area?
25%
What are the two criteria that a “desert” has to meet for it to be a desert?
- Must receive less then 255mm of rainfall per year
- sparsely vegetated
How do we split up, divide, or categorize deserts?
two categories:
- deserts formed by global air circulation
- deserts formed by local climate conditions
Which two types of deserts are formed based on their location on the globe (global air circulation)?
- subtropical deserts
- polar deserts
Global circulation units lead to up flows of warm and wet air at the ______
equator
bands of ______ form some of the major deserts
latitudes
Subtropical deserts are located at approximately _____ degrees North and _____ degrees South
30, 30
Where are polar deserts located?
at approximately 90 degrees North and south
Do polar deserts get a lot of snow?
no, whatever snow they get just never goes away
What 3 kinds of deserts form due to local climate conditions?
- continental interior deserts
- rain shadow deserts
- coastal deserts
_____ ______ deserts are located far inland
continental interior
e.g.
Gobi Desert, north China/ South Mongolia
Are continental interior deserts located close to a source of water?
No
Where do rain shadow deserts form?
along mountain ranges
E.g.
death valley, rain blocked by Sierra Nevada mtns
Mountain ranges serve as a _____ to block precipitation
barrier
What happens when clouds and weather systems come towards a mountain?
As clouds and weather systems come towards a mountain the steepness and height of a mountain forces that air system up and as it rises it drops a lot of it precipitation so by the time it reaches the other side of the mountain it is very dry air.