click below
click below
Normal Size Small Size show me how
Geo Ch.19
Final
| 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 |