Lesson 7:

Formation of

When writing about features of deposition explain:

This is Glacial Till, unsorted and unstratified (not sorted into layers) boulders, gravel and clay.

Features - drumlins, moraines, erratics

These are deposited by meltwater rivers (fluvio glacial) leaving landforms made from sorted and stratified (layered) material.

Features - eskers, kame terraces

Glaciation Depositional Features

These features are straight forward and your task is simply to try and understand the processes which explain how they form

Digital Workbook and Paper Jotter

Material finds itself within a glacier through the processes of plucking (explain term) or freeze thaw (explain term)
the glacier flows carrying this material, known as moraine, along with it inside, pushed in front.
When the glacier begins to melt or becomes overloaded it will lose energy it can no longer carry the moraine.
Drumlins are elongated hills made up of unsorted glacial deposits/till/boulder clay.
The glacier may continue to flow over the sediment it has deposited streamlining it.
If there is a small obstacle on the ground, this may act as a trigger point and till/boulder clay can build up around it.
They may also be reshaped by subsequent glaciation.

Write about how glaciers pick up, transport and then lose energy to deposit material

Then:

Eskers are meandering ridges formed by meltwater streams in or underneath a glacier.
They are therefore made up of meltwater sands and gravels.
These are sorted by size with large stones at the base because larger stones are dropped first by flowing water.
The stones also tend to be more rounded than glacial deposits, because of the action of flowing water rounding the edges by erosion.