Erosion and Deposition
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Transcript of Erosion and Deposition
Erosion and Deposition
Glaciers
Glaciers
● Glacier - a large mass of ice that moves over land
● Alpine glaciers – occur in mountain and are erosional
● Continental glaciers – occur on flatter land and are mostly depositional.
Glaciers
● Glaciers occur in a cold region where more snow falls than melts each year.
● In alpine glaciers the weight of the heavy mass of ice causes it to flow downward slowly.
● A continental glacier spreads out under its own weight.
Alpine Glaciers
● Cirque – a bowl-shaped erosion near the top of a mountain caused by a glacier through ice wedging.
● Horn – a sharp peak where 3 or 4 cirques come together.
● Arete – a ridge that forms where 2 cirques come together.
● Alpine glaciers create U-shaped valleys.
Moraines
● Till – different sized sediments deposited by a glaciers.
● Moraine – a deposit left behind by a retreating glacier.
● End moraine – left at the end or toe of a glacier.● Lateral moraine – left at the sides of a glacier.● Medial moraine – left in the middle, where two
glaciers come together.
Glaciers
● Kettle – occurs when a large chunk of ice becomes buried in the soil. When the glacier retreats, the ice melts forming a lake.
● Esker – a sinuous ridge of sorted till that forms as sediment is laid in a river that forms on or under a glacier.
● Kame – a mound of sort till that forms in a lake that form on a glacier.