The Last Ice Age (Leaving Cert Geography): Flashcards
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15 cards from this deck
% of Earth's land currently covered by glaciers
% of Earth's land currently covered by glaciers
10%
Term for extended cold periods
Term for extended cold periods
Ice ages
Two processes glaciers use to modify terrain
Two processes glaciers use to modify terrain
Erosional and depositional processes
When the last ice age started
When the last ice age started
Approximately 2.6 million years ago
When the last ice age ended
When the last ice age ended
Around 10,000 years ago
Geological period of the last ice age
Geological period of the last ice age
Pleistocene
Number of distinct glacial advance periods identified
Number of distinct glacial advance periods identified
At least five
Who first proposed ice age theory
Who first proposed ice age theory
Louis Agassiz
Effect of ice sheet weight on Earth's crust
Effect of ice sheet weight on Earth's crust
Causes crust to sink; removal causes rebound upwards
Condition needed for glacier formation
Condition needed for glacier formation
Snow must accumulate faster than it melts
Definition of firn
Definition of firn
Compacted snow with 20-30% air in round grains
Air content in fresh snow
Air content in fresh snow
90%
Air content in glacial (blue) ice
Air content in glacial (blue) ice
About 20%
Climate period we currently live in
Climate period we currently live in
Interglacial period
What are continental glaciers
What are continental glaciers
Ice sheets from multiple joined glaciers covering continents