Physical processes 1 (Edexcel GCSE Geography A): Flashcards
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15 cards from this deck
Two processes shaping river landscapes
Two processes shaping river landscapes
Weathering and mass movement
Weathering definition
Weathering definition
Breakdown of rock at valley sides whilst in place
Three types of weathering
Three types of weathering
Mechanical, chemical, and biological
Freeze-thaw weathering process
Freeze-thaw weathering process
Water in cracks freezes, expands, widens crack, rock breaks
% water expands when freezing
% water expands when freezing
9%
Scree
Scree
Loose rock fragments at base of slopes from freeze-thaw
Chemical weathering effect on rock
Chemical weathering effect on rock
Changes the chemical composition of rock
Granite's feldspar converts to what via chemical weathering
Granite's feldspar converts to what via chemical weathering
Soft clay minerals
How biological weathering breaks down rock
How biological weathering breaks down rock
Plant roots physically & organic acids chemically
Mass movement definition
Mass movement definition
Downward movement of weathered material under gravity
Sliding in mass movement
Sliding in mass movement
Material moves down as gravity overcomes holding forces
When sliding most likely occurs
When sliding most likely occurs
After heavy rainfall when ground becomes saturated
What causes slumping
What causes slumping
River erodes bottom of valley slope making it unstable
Feature created by slumping
Feature created by slumping
Curved failure surface
How weathering & mass movement work together
How weathering & mass movement work together
Weathering weakens rock, mass movement transports it downhill