INTRODUCTION TO PHYSICAL GEOLOGY CONTINUED

1. PHYSICAL GEOLOGY
PART 1B
THE EARTHLY PROCESSES:
EROSION TRANSPORT AND DEPOSITION
-BISHAL SAHA

2. The various primitive processes
• Weathering : The process of disintegration of rocks due to
some physical, chemical and biological conditions is called
weathering. The weathered debris is called sediments.
• Erosion : The process of washing away of the weathered
material is called erosion.
• Transport : The journey of the washed out debris until it
gets deposited is called transport.
• Deposition : The settling down of the washed out
sediments at a favourable location is called depostion.

3. Erosion and transportation
• Erosion is the removal of weathered debris from the place of formation and
transportation is the journey to zone of deposition.
Wind erosion
Source : internet
Glacial erosion
Source : Internet
Marine erosion
Source : inetrnet
River
erosion
Source:
internet

4. Processes of erosion
2. Hydraulic action
Source : internet1. Deflation
Source : Internet
3. Abrasion and attrition
Source : internet

5. Transport mechanisms
Suspension : particles are not in
contact with ground
Traction : particles move in
continuous contact with ground
Saltation : jumping motion of
particles
Source : Bishal Saha

6. DeposItion
• Settling down of eroded debris at favourable location.
• The favourable location of deposition is called depocentre.
Wind
deposits
Source :
internet
River deposits
Source :
internet
Glacial
deposits
Source :
internet
Marine
deposits
Source :
internet

7. References :
• A text book of physical geology by
G.B.Mahapatra.
• Principles of physical geology by Arthur
Holmes.
• Principles of engineering geology by
K.M.Bangar.