Mechanical Weathering Processes (Leaving Cert Geography): Flashcards
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Mechanical weathering definition
Mechanical weathering definition
Breaking rocks into smaller pieces without changing chemical composition
Two main types of mechanical weathering
Two main types of mechanical weathering
Freeze-thaw action and exfoliation
Where does freeze-thaw action occur?
Where does freeze-thaw action occur?
Cold climates, alpine environments, upland areas
3 conditions needed for freeze-thaw
3 conditions needed for freeze-thaw
Water supply, pre-existing cracks, temp fluctuations
Water expansion % when freezing
Water expansion % when freezing
9%
Pressure created by freezing water
Pressure created by freezing water
110 kg/cm²
Scree definition
Scree definition
Broken angular rock fragments at bottom of slopes
Irish example of freeze-thaw weathering
Irish example of freeze-thaw weathering
Croagh Patrick (Mayo) or Carrantouhill (Kerry)
Alternative name for exfoliation
Alternative name for exfoliation
Onion weathering
Key difference of exfoliation process
Key difference of exfoliation process
Doesn't require water, uses temperature changes
Quartz vs feldspar expansion rate
Quartz vs feldspar expansion rate
Quartz expands 3 times as much as feldspar
Block disintegration definition
Block disintegration definition
Breakdown into rectangular blocks via freeze-thaw + exfoliation
Three Rock Mountain (Dublin) is an example of
Three Rock Mountain (Dublin) is an example of
A tor formed through doming