Arid Landscape Development (AQA A-Level Geography): Flashcards
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Avg. annual rainfall in Sahara (mm/yr)
Avg. annual rainfall in Sahara (mm/yr)
Around 25 mm per year
Sheet flooding in deserts
Sheet flooding in deserts
Widespread surface water flow from intense rainfall
Wadis (arroyos)
Wadis (arroyos)
Steep-sided dry valleys with occasional flash floods
Ventifacts
Ventifacts
Rocks abraded by wind-blown sediment, with smooth facets
Yardang shape resembles
Yardang shape resembles
Upturned boat keel (streamlined ridge)
Barchan dune shape
Barchan dune shape
Crescent-shaped with horns extending downwind
Barchan migration rate (max m/yr)
Barchan migration rate (max m/yr)
Up to 30 metres per year
Seif dunes also called
Seif dunes also called
Longitudinal dunes (sword-dunes in Arabic)
Alluvial fan sediment is
Alluvial fan sediment is
Graded: coarsest upstream, finest downstream
Playas also known as
Playas also known as
Chotts or salt lakes