Action of Wind in Desert – Wind is defined as the natural movement of the air, especially in the form of a current of air blowing from a particular direction.
The action of wind is dominant in the desert and other semi-arid regions of the world. Desert which are associated with aridity (dryness) are caused by low rainfall, high temperature, cold current and high evaporation rate.
Wind is a powerful force that has the ability to shape a landscape. In deserts, wind action changes the landscape through wind erosion in the form of abrasion and deflation.
ACTION OF WIND EROSION
Wind erosion is the process of breaking down and dispersing particles by wind movement. Wind erosion occurs by three different methods, which are abrasion, deflation and attrition.
Wind abrasion is the process of the wearing away of a solid object due to the impact of particles carried by the wind.
Wind deflation is the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind.
Wind attrition is the process whereby wind borne particles collide with one another, resulting in the wearing away of each other.
MEANING OF A DESERT
A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life
CHARACTERISTICS OF DESERT
- Extreme temperature – Deserts do experience extreme high temperature during the day and extreme low temperature at night. Temperature can be as high as 49° C during the day, and as low as 18° C at night.
- Low rainfall – Generally, a desert receives less than 10 inches or 25 centimeters of precipitation a year.
- Deserts are characterised by low vegetation
- Deserts have limited numbers of plants and animals that are able to survive.
- Deserts do experience cold currents.