Glacial Meltwater Landforms And Landscapes Flashcards
How does meltwater move throughout a glacier
Meltwater streams
Discharge is variable with conditions and seasons
What is fluvio-glacial
Refers to erosion of deposition caused by meltwater
What happens when temperatures drop in meltwater streams
Fluvio-glacial deposition occurs
What are the characteristics of till and fluvio-glacial deposits x4
Clast shape
Imbrication
Stratification and grading
Sorting
What is till
Deposits of angular rock (clasts) in finer matrix unstratified (not layered) unsorted (mixture of clast sizes) and erractics (mixture of geology)
What is clast shape
Rock fragments
They are either angular or smooth/round
What is imbrication
The preferred orientation and dip caused by a current
What is stratification and grading
Deposits are layered with coarse sediments at the bottom and grading upward into finer sediments
What is sorting
Sorted sediment has a common grain size
The characteristics of till and fluvio-glacial deposits (differences)
Clast shape
Till- clasts frozen to ice, limiting movement and maintain angular shape
Fluvio-glacial debris- attrition in meltwater causes the clasts to be more round
The characteristics of till in till and fluvio-glacial deposits