Geography – Arid environments | e-Consult

Arid climates exhibit several distinct physical characteristics:

• High Temperature Variations: A defining feature is the large diurnal (daily) temperature range. Days can be extremely hot, often exceeding 40°C (104°F), while nights can be surprisingly cold, sometimes dropping below freezing. This is due to the lack of cloud cover to trap heat.
• Sparse Vegetation: Vegetation is typically sparse and adapted to drought conditions. Common plant types include xerophytes – plants with adaptations like deep roots, reduced leaf surface area (e.g., spines), and water storage tissues (e.g., cacti). Examples include cacti, succulents, and drought-resistant shrubs.
• Soil Development: Soil development is often limited due to the lack of organic matter and slow weathering rates. Common soil types include sandy soils, gravelly soils, and alluvial soils deposited by infrequent floods. Soil often has a high salt content due to evaporation.
• Low Precipitation: Annual precipitation is very low, typically less than 250mm (10 inches). Precipitation is often infrequent and unpredictable.
• Strong Winds: Arid regions are often characterized by strong winds, which can contribute to soil erosion and dust storms.