Glacial Landscapes Flashcards
Where are Lowlands usually? (height)
Close to or below 200m above sea level
Where are Uplands usually?
Made up of Mountains or high hills.
Usually 600m above sea level.
Is Loch Ness an Upland or a Lowland?
Upland but its in a valley
What’s plateau?
A flat area at the top of a steep slope
What does the Tees-Ex line show/separate?
Upland/Lowland areas of Britain.
When was the last Ice Age?
22,000-12,000 years ago
How thick was the ice in the last Ice Age?
3km Thick
Why did Glaciers flow downhill?
Gravity
What’s a glacial period?
(Hint: Temperature)
When global temps drop from 15 to 1 and the ice begins to advance
What’s an interglacial period?
Where the temperature increases significantly and the ice retreats
What’s a glacier?
Slow moving mass of Ice. Going downhill
What is weathering a form of?
Erosion
What’s a common type of weathering?
Freeze-Thaw Weathering
What happens at the first stage of Freeze-Thaw weathering?
Water gets in the cracks in the rocks
What happens in the night with Freeze-Thaw Weathering
Overnight the water freezes expanding this puts pressure on the rock
What happens to the rock over time as a result of Freeze-Thaw Weathering?
Over time and pressure the rock breaks
What’s the consequence of Freeze-Thaw Weathering that can be seen on sides of mountains?
Scree – small pieces of rock
What is Glacial Erosion?
Wearing away and removal of land due to water, ice or wind.
What are two types of Glacial Erosion?
Abrasion and Plucking
What is Plucking?
Due to friction the glacier melts, this water gets into the cracks of the rock below. The water freezes and the rock effectively become part of the glacier and is ripped out when the glacier moves
What is Abrasion?
Rocks at the bottom of the glacier acts like sandpaper, grinding over the rock below. This can polish the rock or create sharp grooves called striations
When a glacier moves what does it transport?
Till
What’s material called that is transported under the Glacier?
Subglacial Material
What’s material called that is transported in the glacier?
Englacial Material