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TYPES OF LAVA FLOW (Aa FLOW (Major lava type, Subaerial, Rough),…
TYPES
OF
LAVA FLOW
Aa FLOW
Major lava type
Subaerial
Rough
PAHOEHOE FLOW
Continuos
Low effusion rate
Smooth
BLOCKY FLOW
Resembles Aa lava
Larger lava blocks
High silica content
PILLOW FLOW
Associated with water
Associated with mid-ocean ridge volcanism
Andesitic/ basaltic
BASALTIC FLOW
non- eruptive
voluminous
Has low viscosity
COLUMNAR FLOW
Consist of columns
forms when rocks contracts
Structures that forms rocks