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Physical
Rocks and weathering
Rock type and structure affecting weathering
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Created by
Isabella Wales
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Cards (24)
How does rock type influence weathering?
It affects
rate
and type of weathering
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What are the factors due to which rock type influences weathering?
Chemical composition
,
cements
, joints
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What is limestone primarily composed of?
Calcium carbonate
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Why is limestone susceptible to carbonation solution?
Because it consists of
calcium carbonate
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What are iron oxide-based rocks prone to?
Oxidation
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How resistant are quartz cements to weathering?
Very
resistant
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What is the relationship between rock structure and weathering?
Joint patterns
control water movement
Create lines of weakness
Coarse-grained
rocks weather quickly
Fine-grained
rocks have greater
surface area
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What is the porosity percentage of granite?
1%
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What is the permeability of sandstone?
500
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What is the porosity percentage of clay?
45%
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How do coarse-grained rocks weather compared to fine-grained rocks?
Coarse-grained rocks weather
quickly
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Who stressed the importance of individual minerals in weathering?
Goldich
in
1939
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What type of materials resist weathering according to Goldich?
Resistant
materials like
quartz
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How do limestone and granite illustrate the interrelationship of geology and climate on landforms?
Limestone reacts with
acidified
water
Granite has a
granular
texture
Limestone is rich in
fossil
content
Granite is rich in
quartz
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What happens to non-porous limestones when heated to 1000 degrees?
They dissociate
calcium carbonate
, CO2, and limestone
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What type of rock is granite?
Igneous
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How do limestones differ from granites in terms of fossil content?
Limestones
are
rich
in
fossil content
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What is the permeability of limestone?
30
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What is the permeability of clay?
10
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What is the significance of joint patterns in rocks?
They create
lines of weakness
for weathering
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How does the chemical weathering of limestone differ from granite?
Limestone reacts with
acidified
water
,
granite
does not
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What is the effect of high permeability in coarse-grained rocks?
They weather quickly due to large
voids
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What is the chemical composition of limestone?
Calcium carbonate
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What is the role of surface area in fine-grained rocks regarding weathering?
They offer
greater
surface
area
for weathering
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