null
US
Sign In
Sign Up for Free
Sign Up
We have detected that Javascript is not enabled in your browser. The dynamic nature of our site means that Javascript must be enabled to function properly. Please read our
terms and conditions
for more information.
Next up
Copy and Edit
You need to log in to complete this action!
Register for Free
64688
Cold Enviroments
Description
Geography-Food Supply Mind Map on Cold Enviroments, created by hughwhitlock96 on 01/05/2013.
No tags specified
geography-food supply
geography-food supply
Mind Map by
hughwhitlock96
, updated more than 1 year ago
More
Less
Created by
hughwhitlock96
over 11 years ago
60
1
0
Resource summary
Cold Enviroments
Glaciers movement
Basal Slippage
this is a sliding effect of the glacier over the bedrock by either regelation slip or creep
regelation slip operates most effectively with smaller obstacles, while creep is the process that overcomes larger obstacles
on the upglacier side of an obstacle, the increasing pressure in the lower ice causes pressure metiling locally.
this meltwater permits slippage of the ice cover the obstacle but then refreezes in the lower pressure conditions of the downside of the obstacle.
internal flow/ internal deformation
this is the movement within the glacier ice resulting from the stresses applied by the force of gravity.
Where ice crystals orientate themselves in the direction of the glaciers overall movement, they may slide past eachother.
Such movements often result in the formation of crevasses within and at the surface of the ice
Landforms produced by glacial erosion
Aretes
these are formed when 2 or more ciques erode back towards each other from opposing sides, they produce a knife edge ridge between them called an arete
e.g. Striding Edge above Red Tarn, Lake District
Pyramid Peaks
where 3 or more cirques erode back towards each other, a pyramind peak may form.
e.g. the Matterhorn
Landforms
Roche moutonnes
masses of more resistant rock that have smooth, rounded upvalley slopes formed by abrasion. the downvalley sides are steep and jagged.
which reflects the plucking action that formed them
Abrasion on the upvalley side may have left striations as pieces of rock debris within the ice were dragged accross the surface under great pressure
Rock Drumlins
these are more streamlined bedrock and lack the jagged downhill slope.
Crag & Tail
this consists of a larger mass of resistant rock or crag and a gently sloping tail of less resistant rock/ or sediment on one side.
Striations
when glaciers move accross exposures of rock, angular debris embedded within the ice may leave paralell scratches and grooves called strations
Glacial Deposition
Till
all material deposited directly by the ice, largely unsorted in nature
Fluvioglacial material
sediments deposited by meltwater streams. these usually have been sorted with coarser material nearer the the original glacier snout.
finer particles carried further way by the meltwaters.
Moraines
Lateral Moraine
formed from debris fallen from the sides of the valley and transported along the edges of the glacier.
After glaciation it appears as elongated embankments of debris at the sides of the valley.
Medial Moraine
where 2 glaciers meet, the lateral moraine may combine to form a medial moraine towards the middle of the main glacier.
this may eventually form some deposition features once the glacier has retracted.
however the location of the medial moraine towards the middle of the valley may be destroyed by subsequent fluvioglacial action
Terminal Moraine
this is often a high mound or series of mounds of debris that extend across a valley, it marks the furthest extent of the glacier
Influences on the rate of movement
snow and ice masses do not generally move downslope until the thickness exceeds 60m
steep glaciers flow faster than gently graded ones and thus are usually thinner
the amount of precipitation and ablation are significant factors
the greatest velocity is usually at the firn line, as velocity is directly related to thickness
the centre of the glacier, where the ice is thickest, moves more rapidly than the margins, where friction plays a considerable role in reducing speed
Show full summary
Hide full summary
Want to create your own
Mind Maps
for
free
with GoConqr?
Learn more
.
Similar
Food Supply
hughwhitlock96
Tyneside
hughwhitlock96
GCSE Maths Symbols, Equations & Formulae
Andrea Leyden
IB Bio - Mitosis Quiz
j. stu
GCSE CHEMISTRY UNIT 2 STRUCTURE AND BONDING
mustafizk
The Cold War: An Overview
Andrea Leyden
AQA Biology B2 Unit 2.1 - Cells Tissues and Organs
BeccaElaine
CHARACTERS IN OF MICE AND MEN
jessicasusanevans
Historical Context of The Handmaid's Tale
Summer Pearce
2PR101 1.test - Doplňující otázky
Nikola Truong
1PR101 2.test - Část 6.
Nikola Truong
Browse Library