spring half term (asia, population, monsoon, glaciers) Flashcards
What is the middle east?
A geopolitical area consisting of 13 (ish) countries.
Define monsoon
A season of prevailing winds
Is warm or cold air heavier?
Warm
What holds more water: cold or warm air?
Warm
How does monsoon rain happen?
1) Land heats up faster than the water causing warm air to rise.
2) This creates a low pressure over the land
3) Moist air from above the sea fills the space the warm air left
4) This air rises, cools & condenses to cause monsoon rain.
Describe the stages of a glacier
1) Snow (90% air)
2) Granular snow (50% air)
3) Firn (30-20% air)
4)Glacial ice (20% air)
How do lateral morraines form?
Along the side of a glacier, made of weathered material that has fallen from the valley sides above the glacier.
What is a medial morraine?
Material deposited in the middle of a glacier, made of two glacier’s lateral morraines when they join.
What is a terminal morraine?
Material deposited at the snout (end) of the glacier. Shows where glaciers have extended to in the past.
What is a corrie?
A chair shaped valley formed through erosion by glacier.
How does a corrie form?
Back gets steeper from freeze thaw weathering, base of corrie becomes deeper due to abrasion.
What is the zone of ablation?
Area where snow is removed from the glacier.
What is the zone of accumulation?
Area where snow is added to the glacier.
Define plucking
Meltwater freezes around a rock and is plucked as the glacier moves.
Define abrasion
Rocks at the base scrape against the bedrock
