In deserts what is the main source of erosion?
Air or wind
In glaciers what is the main agent of erosion?
_____ and _____ can be sensitive indicators to climate change
Deserts make up how much of Earth's land area?
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
How do we split up, divide, or categorize deserts?
- 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 ______
bands of ______ form some of the major deserts
Subtropical deserts are located at approximately _____ degrees North and _____ degrees South
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
Gobi Desert, north China/ South Mongolia
Are continental interior deserts located close to a source of water?
Where do rain shadow deserts form?
along mountain ranges
death valley, rain blocked by Sierra Nevada mtns
Mountain ranges serve as a _____ to block precipitation
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.
where do coastal deserts form?
along the oceans
Atacama desert, Chile. Driest place on Earth
Do coastal deserts form along the western or eastern side of continents?
Coastal deserts form along the _____ side of continents because there are very cold ocean currents flowing next to the land.
What do cold ocean currents cause?
Cold air holds _____ moisture so there is ____ precipitation
Where is the Atacama desert?
in South America, along the Andes mountains
As clouds and weather systems come towards a mountain the ______ and _____ of a mountain forces that air system up.
As clouds and weather systems rises they drop a lot of _______ so by the time the system reaches the other side of the mountain there is very _____ air.
Are deserts and glaciers rare or common environments?
Why are deserts and glaciers rare environments?
because water is not the main erosional force, air and ice are
Deserts and Glaciers are two types of _____ environments
Deserts and Glaciers are two rare types of environments where _____ is not the main erosional force, but _____ is.