Global Air Circulation (Grade 11 NSC Matric Geography): Flashcards
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Atmospheric pressure definition
Atmospheric pressure definition
Force created by weight of air pressing down on Earth's surface
Pressure at sea level vs high altitudes
Pressure at sea level vs high altitudes
Sea level: higher pressure; High altitudes: lower pressure
Effect of warm air on pressure
Effect of warm air on pressure
Expands, less dense, creates lower pressure
Effect of cold air on pressure
Effect of cold air on pressure
Contracts, more dense, creates higher pressure
Pressure created when air rises
Pressure created when air rises
Low pressure at surface
Pressure created when air sinks
Pressure created when air sinks
High pressure at surface
Polar high pressure location and cause
Polar high pressure location and cause
Around 90°N & 90°S; very cold temps, air sinks
Equatorial low pressure location and cause
Equatorial low pressure location and cause
Around 0°; intense heating makes air rise strongly
Subtropical high pressure location
Subtropical high pressure location
Around 30°N and 30°S (horse latitudes)
Mid-latitude low pressure location
Mid-latitude low pressure location
Around 60°N and 60°S where warm & cold air meet