Glacial Processes and Landforms
______ refers to the removal of glacial ice and involves melting, sublimation, and calving.
Ablation
Glacial striations are formed by way of _____.
Abrasion
Which process of stream erosion also occurs at the base of a glacier?
Abrasion
Glacial Ice
Begins as snow, becomes compressed over time and increases in density (snow-firn-glacial ice_. Humid climates form glacial ice more rapidly than drier
Cirque
Bowl-shaped basin near the summit of a mountain, resulting from plucking
A solitary hill composed of reworked glacial till deposited by a previous glacier is called a _____.
Drumlin
A glacial valley that has been flooded by the sea is called a ______.
Fjord
Name the types of glacial landforms
Glacial trough Cirque Arete
Calving
Ice breaks off the end of the iceberg
Glacier
Large mass of perennial ice on land or floating shelf-like adjacent to land
Tarn
Small lake occupying a cirque
Drumlin
Solitary hill of reworked glacial till Elongated in the direction of glacial movement
Stratified Drift
Sorted rock material deposited by glacial meltwaters
Horn
Steep, rocky peak that has been eroded on several sides by glaciers
Glacial sediments, consisting of sand and gravel, that have been deposited by meltwaters are called ______.
Stratified drift
Glacial Till
Unsorted rock material deposited directly by a glacier
Glacial trough
Valley that has been reshaped by glacial erosion Deep, steep-sided with a wide, flat floor "U-shaped" valled Ex. Fjord, hanging valley, etc.
Arete
Shear, "knife-like" ridge between two cirques or two troughs Horn
Which of the following glacial landforms is composed of glacial till?
Moraine
Name the types of depositional landforms
Moraines Drumlin Esker
Esker
Narrow, winding ridge of sand and gravel (stratified drift), formed where a meltwater stream once flowed along the base of a glacier
Plucking
Pieces of bedrock are pulled loose at the base of the glacier
Name the processes of glacial erosion
Plucking Abrasion Surface transport
Ablation
Removal of glacial ice Involves melting, sublimation, and calving
Moraines
Ridges of glacial till Ex. Lateral and medial moraines
Surface transport
Rock material carried on the surface of the glacier as a result of mass movement and erosion from the surrounding slopes Glacier acts as slow-moving "conveyor belt" for rock material
Drift
Rock material deposited as a result of glaciation
Abrasion
Scouring/polishing of the land surface by rocks that are moved along at the base of the glacier Much like sandpaper polishes a wood surface Glacial striations