Download - GSCE Geography Glaciation
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S- Snowcollects inhollows onmountain
sides and iscompresse
d into ice
P-
Pluckingpulls out
rocks fromthe hollow,deepening
it
A-Abrasion,as the ice
movesforwards inthe hollowdue to its
own weight,
rocks thatare in theglacier rub
againstthose in the
hollow
R-
Rotationalmovement
encouragesthe hollow
to be a
basin
E- Freezethaw actionmakes theback of the
hollow
steeper
D- Deephollow, and
when the icemelts thereis often alake or a
tarn left
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Firstly, explain how a corrie isformed (SPARED), then explain thatan arte is the knife edged ridgethat lies between two corries. This
ridge is sharpened further by
freeze- thaw action!
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First explain the formation of acorrie, then explain that a
pyramidal peak is when 3 of theseare surrounding a peak. An
example of a pyramidal peak isthe Matterhorn.
First explain the formation of acorrie, then explain that a
pyramidal peak is when 3 of theseare surrounding a peak. An
example of a pyramidal peak isthe Matterhorn.
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A river flows in asmall depression.
Eventually, vertical
erosion occurs,making a deeperdepression.
The sides of thevalley then
collapse
eventuallybecause the sideshave pressure put
on them.
This leaves the rivervalley a V shape
But when the riverfreezes, it expandsand erosion occurson both the valleywalls and floor due
to abrasion andplucking
(definitions).
This leaves a Ushaped valley.
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River valleys often have
interlocking spurs, but whena glacier moves through
these, the spurs are cut off,making truncated spurs.
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When iceerodes a
main valley,
it alsoerodes thetributaryvalleys .
However it willerode the larger
main valleymuch quicker
than It will erodethe smaller
tributary valley.
When the icemelts the
tributary valleyis left hanging
above themain valley.
It will then
cascadedown tothe main
valley as awaterfall.
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Whenglaciersmove
througha valley,
theyerode
thebase byabrasion and
plucking.
For a
ribbonlake to beformed,the icehad to
erode inone part
of thevalley
more toform a
depression. This
could befor manyreasons.
Therock
couldhavebeensofter,so the
iceerodesdeeper
andmore
quickly.
The icecouldhave
erodedmore
becaus
e therewas asteepergradien
t.
It couldalso bebecaus
e oftributar
y
glaciersjoiningthe
mainone.
When
the icemelts alake is
formedin the
depression. This
maywell bedamned in by
terminalmoraine
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They are made from boulder clay,and are usually between 30-40mhigh and about 300-400m long.
When the glacier meets an
obstruction, it deposits on one endof the obstruction (sharp end), itthen deposits the rest on the otherend, and the flow of ice over this
part shapes it (tapered end).
When the ice of a glacier starts tomelt, deposition starts to occur
because its ability to carry materialis reduced.
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Cold.
Wet.
Lack of
sunshine.Snow.Soil onslopescouldhave
beeneroded byGlaciation
.
Land issteeper,
particularlyvalley sides.
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Example- The Lake District
Footpath erosion is managed by diverting
the course of the footpath, laying downartificial footpaths, or fencing off footpathsto give them time to recover.
Damage to stone walls is solved bybuilding stiles.
People walking on the crops is solved byputting up warning notices.