LITHOSPHER E INTRO GLACIATION These slide-shows will all

LITHOSPHER E INTRO GLACIATION These slide-shows will all

LITHOSPHER E INTRO GLACIATION These slide-shows will all be on the blog if you wish to copy any notes from them; we will not be stopping in class for you to do this The symbol means copy the text on this slide. 1 LITHOSPHER E INTRO GLACIATION The Ice Age was

a series of advances and retreats of the icecaps. It lasted from 1.7 million years to 10,000 years B.P. ( before present) Most of Britain was glaciated as far south as the Severn-Thames line. 2 LITHOSPHER E INTRO GLACIATION Glaciers

form in areas of permanent snow called snowfields. These occur at high altitudes, latitudes nearer the poles and often on the colder, northfacing slopes. 3 LITHOSPHER E As more snow falls the pressure makes the earlier snowflakes melt. INTRO GLACIATION

Repeated melting and re-freezing forms granules called firn or nv. Further compression forms larger crystals of glacial ice. It can take 30 to 40 years for snow to form dense glacial ice. Gravity now moves it downslope. 4 LITHOSPHER E Ice erodes in the upland areas using three main processes and creating the

features shown on p7-10/91-103. INTRO GLACIATION The products of erosionmoraine and other material- are transported to lower ground where they are deposited in areas in specific shapes. 5 LITHOSPHER E EROSION GLACIATION

PROCESS 1 Freeze-thaw/ frost shattering Water from melted snow collects in cracks and crevices in rocks above glaciers. At night temperatures drop below freezing and the water changes into ice. Water expands when frozen and forces the crack wider. When it warms, ice melts and the wider crack can

hold even more water. After several sessions, the rock shatters. Sharp, angular pieces of rock called scree fall to the foot of the slope. 6 LITHOSPHER E Glacial ice freezes into the cracks and crevices made by the freezethaw process and as the glacier moves, loose pieces of rock are pulled

or torn out. EROSION GLACIATION PROCESS 2-Plucking Note; This rock has joints and bedding planes! 7 LITHOSPHER E EROSION GLACIATION PROCESS 3-Abrasion Abrasion occurs when pieces of rock debris that are embedded in the ice rub away at the rocks on

the valley floor and sides like sandpaper. 8 LITHOSPHER E EROSION The rock is scratched, polished, smoothed and eventually worn away by the scouring action. GLACIATION Striations are scratches made on the existing surface by rocks that are embedded in the

bottom of the glacier as it moves forward. 9 LITHOSPHER E EROSION GLACIATION use the previous notes to un-jumble the following heads and tails. There is only one best fit answer! The tails are one line long. a). Freeze-thaw process results in b). Plucking results in c). Abrasion results in d). Rock flour is the result of f). Angular rock fragments result from

10 LITHOSPHER E EROSION GLACIATION jagged rocks. plucking and frost shattering. frost shattered rocks. abrasion. smooth rocks with striations. 11

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