History of finnish soil Flashcards
1
Q
What is till?
A
An unsorted soil type.
- mixture of sand, rock, silt, clay…
In Finland, roughly 50% of the area is covered with till
2
Q
Classification of till? (3 types)
A
Silt till -> fine
Sand till -> something in between
Gravel till -> coarse
3
Q
What is moraine?
A
Formation made out of till, for example, a hill.
4
Q
Why does Finland have till?
A
Started from Ice age:
- Ice age cleared all soil over the bedrock
- Everything we have now is thanks to Ice age
5
Q
What happened under the glacier?
A
Heavy pressure (3000 m of ice at the top)
- bedrock was crushed
- Ice was moving as it was expanding
- Rivers run under the ice
6
Q
What is terminal moraine?
A
Its a name for moraine of time when ice didn’t melt and temperature didn’t rise for several hundreds of years
7
Q
What happened after the ice age?
A
Finland was covered with water
- Land was compressed because of the heavy ice -> started to slowly rise
- Old sea bed -> silt and clay formation
