External Geological Agents in the Canary Islands
WAVES 
WIND
TORRENCIAL LANDSCAPES
What is the wind? Wind is not a very pwerful agent. Aeolian processes are the only important in arid enviroments with sparse vegetacion and large suply of line and unconsolidated sediment
What are waves? They are created by wind blowing the surface of the ocean. Waves strike the shore repeatedly and desintegrate the rocks mechanically. They are also very effective agents of erosion, transportation and deposition.
How do rainfall, surface runoff and temporary watercourses shade landscape? Torrencial landscapes
PROCESSES
LANDFORMS
Deflation
Rocky deserts or pavements
Mushrooms - shaped rocks
Abrasion
The wind removes fine, loose particles from the ground
Suspended particles erode the rocks close to the surface
Destructive waves
Constructive waves
If the backwash is stronger than the swash, the dislodged particles are removed (erosion).
If the swash is stronger than the backwash , deposition occurs
In arid regions with scare vegetation and sporadic but torrencial showers, rainfall intensity quikly exceeds soil inflitration capacity and important surface runoff ir produced, thus eroding and shaping landscape
Torrential erosional processes and landforms Sometimes runoff concentrates on certain flow paths and cuts a well defined channel on the hillside, that grows from small guilles to ravines or deep gorges
Ravines
Fairy chimneys
Gullies
Raindrops cause mechanical weathering and desintedrates soil materials