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12 cards from this deck
Arid=permanently dry; drought=temporarily dry conditions
High atmospheric pressure systems prevent clouds & rainfall
10-250mm
15 consecutive days without rainfall
Region receives less precipitation than long-term average
High pressure systems established over area for long periods
Water cycle receives less input, affecting groundwater & rivers
Drier land→less moisture→less future rainfall
Hadley & Ferrel cells create descending dry air zones
Reduces transpiration & atmospheric moisture locally
Restrict water flow, reducing volume downstream & groundwater
Transpiration releases water vapour; roots store & release water
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