Question | Answer |
Impact Of Glaciers on the landscape | Snowpack over years turn into ice |
Continental ice sheets(type of glaciers) | Exist in nonmountainous areas |
Examples is Continental ice sheets | Antarctica & Greenland |
Mountain Glaciers (type of glacier) | Highland ice fields: ice sheets the submerge most underlying topography; valley and Piedmont glaciers |
Erosion by glaciers | volume and speed determine success |
Glacial Abrasion | Bedrock worn down by rock debris embedded in glacier |
Glacial Plucking | Picking up of rock material through refreezing of meltwater |
Transportation by glaciers | remaining glacial ice free of rock debris |
Deposition by glaciers | Glaciers move material from one region to another in a vastly different form |
Drift | material moved by glaciers |
Till | rock debris deposited by moving or melting ice |
Erratics | Large boundaries that are different from surrounding local bedrock |
What initiates ice ages? | Eventual total deglaciation
Multiple ice advance and retreat cycles
Hemisphere but in non-uniform |
Climate change relate to | contemporary glaciation |
Medieval Warm Period & Little ice age | 1200-1800 period of cooling
Southward movement of tree line and farming |
Ice cores from Greenland & Antarctica | Plant pollen, summer particles, isotopes, ash from large forest fires, explosions in insect population |
96% of the total ice cover | Greenland, Antarctica, and North America |
About 10% of ice cover | land surface |
Glaciers form by | snow turning into crystallized water vapor that is compressed to granular form it eventually turns in glacial ice. |
Ice sheets are | Third most extensive feature on the planet |
Pleistocene Glaciation began at least | 2.59 million years ago |
Last major ice retreat occurred only | 9000 years ago |
Periglacial zone | zone where ice never existed but glacial factors affected the landscape such as erosion from ice melt, solifluction |
Sea level changes | buldup of ice on continents led to less drainwater on continents and brought about a lowering of sea level |
Pluvial development | considerable runoff results in increased moisture, leading to increased precipitation and less evaporation |