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Published bySavannah McMillan
Modified over 3 years ago
Why are Deserts so dry?
SAHARA DESERT in North AfricaKey places today… North Africa Sahara Desert Atlantic Ocean Canary Islands Morocco Atlas Mountains
1. Deserts are areas of permanent HIGH PRESSUREAir sinks 1. Air warms Moisture evaporates Clear blue skies and dry weather High PRESSURE or anticyclone
2. Deserts lie on the West side of continents….In zones where the prevailing winds come from the east.
Saharan sand blown off to the west by easterly winds.
3. The cold ocean current : THE CANARY CURRENT
Canary Islands - fog
‘It was pretty cold and windy in the damp fog’
San Francisco coast California –Also gets fogs.
3. Moisture condenses out of the air over cold oceans
RELIEF RAINFALL and RAIN SHADOWAtlantic Ocean Atlas Mountains Sahara Desert
RAIN in Morocco Sahara Desert Rain near Equator
R E L I F A N
Rain Shadow effect hereSahara Desert Begins Relief Rainfall Here
Warm dry air sinks down into the Sahara…… making it a desert
The Relief Rainfall and the Rain Shadow happens in the dry SW USA too.
START Warm air blows. START Warm air blows From the west Off the Atlantic Ocean.
High Pressure or Anticyclones
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FACTORS INFLUENCING CLIMATE The factors that influence climate can be identified by using the following anagram: J. BOWLER J. = Jet Stream B = Bodies of.
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