Which mechanism causes descending air in Hadley cells to create desert regions around 30 degrees latitude?

💡 Explanation

When air descends in the Hadley cell it undergoes adiabatic compression, because pressure increases, which warms the air, reducing relative humidity and limiting precipitation possibilities. Therefore desert formation results, rather than moisture condensation, wind deflection, or orographic lift which leads to increased precipitation.

• Which risk increases when rapid river incision exposes unconsolidated levee sediments during channel migration?
• Upriver sediment load decrease causes increased channel sinuosity, producing which feature?
• Which mechanism causes high-altitude winds in the jet stream to deflect eastward in the Northern Hemisphere?
• Which process causes the stratification of grain sizes within an alluvial fan deposit?
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