15 terms in 2A
Glacial Systems
A glacial system is an open system comprising inputs (precipitation as snow), processes (compaction, ice flow, ablation)
Glaciated Landscapes and Change
Glacier Movement
Glacier movement occurs through two primary mechanisms: internal deformation (plastic flow of ice crystals under pressur
Glaciated Landscapes and Change
Periglacial Processes
Periglacial processes involve frost action, ground freezing, and related phenomena that occur in areas adjacent to glaci
Glaciated Landscapes and Change
Permafrost
Permafrost is ground that remains frozen throughout the year for at least two consecutive years. It ranges from a few me
Glaciated Landscapes and Change
2A.3: Erosion Processes
Glacial erosion involves the physical and mechanical processes of plucking and abrasion, whereby glaciers remove bedrock
Glaciated Landscapes and Change
2A.3: Erosion Processes
Mechanical and hydraulic processes by which glaciers erode, transport, and deposit sediment, creating distinctive glacia
Glaciated Landscapes and Change
2A.4: Cirques
A cirque (also called corrie or cwm) is a steep-walled, amphitheatre-shaped depression at the head of a glacier, typical
Glaciated Landscapes and Change
2A.4: Cirques
An arete is a sharp, narrow ridge formed where two cirques or glaciers erode the adjacent mountainsides. The ridge is cr
Glaciated Landscapes and Change
2A.4: Cirques
Glacial troughs are deep, U-shaped valleys eroded by glaciers, characterized by steep valley sides and a flat or gently
Glaciated Landscapes and Change
2A.5: Moraine
Moraine comprises rock debris of all sizes transported by glaciers and deposited either directly by ice or by meltwater.
Glaciated Landscapes and Change
2A.5: Moraine
Drumlins are smooth, streamlined hills composed of glacial sediment, typically 15-40 m high and 300 m to 3 km long. They
Glaciated Landscapes and Change
2A.6: Eskers
Eskers are sinuous, ridge-like landforms composed of stratified sand and gravel. They are formed by meltwater streams fl
Glaciated Landscapes and Change
2A.6: Eskers
Kames are mounds or ridges of stratified sediment (sand and gravel) deposited in direct contact with glacier ice, often
Glaciated Landscapes and Change
2A.6: Eskers
Linear accumulations of sediment deposited by subglacial streams, creating distinctive ridges that follow glacial draina
Glaciated Landscapes and Change