Glaciers
A period of time when much of Earth's land is covered in glaciers.
Ice Age
The last Ice Age started about _____ years ago.
2-3 million
Material deposited directly by glaciers that is unsorted
till
The most dominant factor in shaping desert landscapes.
mechanical weathering
Two ways wind erodes land surfaces.
deflation or abrasion
A thick ice mass that moves slowly over the land surface.
glacier
The movement of glaciers is referred to as.
flow or glacial flow
Rock debris laid down by glacial meltwater that is sorted
stratified drift
This type of stream always contains water
permanent
Deflation creates this kind of stony surface layer.
desert pavement
The lowest elevation in a particular area that remains covered in snow all year.
snowline
Glaciers advance when
List two types of landscapes that are form from depositional feature glaciers
moraines, outwash plains, kettles, drumlins, and eskers
This type of stream does not always contain water
desert
Windblown silt can build up forming this thick deposit/vertical cliffs.
loess
Ice masses that slowly advance down valleys that were originally occupied by streams.
valley glacier
These form where cirques occur on opposite sides of a divide.
Aretes
Layers or ridges of till left when glaciers melt.
moraines
The dry, flat lake bed that remains after the water dries up.
playa
When wind encounters an obstruction it deposits sand in mounds or ridges called these.
dunes
Ice sheets are enormous ice masses are sometimes called these.
continental glaciers
The two ways glacial flow happens.
plastic flow and basal slip
These form when blocks of stagnant ice become buried in drift and eventually melt.
kettles
A cone of debris which forms at the mouth of a canyon.
alluvial fan
The shape of dunes depends on these.
wind direction and speed, how much sand is available, and the amount of vegetation