Wind Erosion: Erosion by wind is less than by WATER and GLACIERS By 2 processes: Abrasion: Saltation grains rub on one another (Sand Blasting) Occurs at a small scale, because sand can only be carried about 1 m above surface Therefore, abrasion creates NO NEW FEATURES, but modifies existing features by etching, pitting, smoothing, polishing Deflation : Removal of loose surface sediments Forms DEFLATION HOLLOWS OR BLOW OUTS e.g., in Great Plains Regions of US , Egypt, Australia Removal of fine materials exposes coarse particles and rocks, called DESERT PAVEMENT Once formed, desert pavements protect underlying material from further erosion Wind Deposits 2 main types - Dunes and Loess A. Dunes: Mound or ridge of wind deposited sand Formed when wind blows over obstruction First, 2 wind shadows are formed around obstacle: Figure here.
(Wind; Deposits; 2 main types - Dunes and Loess A. Dunes: Mound or ridge of wind deposited sand Formed when wind blows over obstruction First, 2 wind shadows are formed around obstacle: Figure here) (wind; blows; over obstruction; T:First) (desert pavements; protect; underlying material; from further erosion) (abrasion; creates; NO NEW FEATURES) (2 wind shadows; are formed; L:around obstacle; T:By 2 processes) Context(2 wind shadows are formed,List([786, 811))):(Saltation grains; rub; on one; another (Sand Blasting) Occurs; because sand can only be carried about 1 m above surface) Context(Saltation grains rub 2 wind shadows are formed,List([91, 811))):(Wind Erosion; is; less than by WATER and GLACIERS) (sand; Formed; T:when wind blows over obstruction First) (DESERT PAVEMENT Once; formed; )
2 wind shadows are formed,List([786, 811)) Saltation grains rub 2 wind shadows are formed,List([91, 811))
Wind wind desert pavements abrasion 2 wind shadows Saltation grains Wind Erosion sand DESERT PAVEMENT Once
Deposits blows protect creates are formed rub is Formed formed
2 main types - Dunes and Loess A. Dunes: Mound or ridge of wind deposited sand Formed when wind blows over obstruction First, 2 wind shadows are formed around obstacle: Figure here
over obstruction T:First
underlying material from further erosion
NO NEW FEATURES
L:around obstacle T:By 2 processes
on one another (Sand Blasting) Occurs because sand can only be carried about 1 m above surface
less than by WATER and GLACIERS
T:when wind blows over obstruction First