The Arctic Tundra background #1 Flashcards
1
Q
How much and where does it occupy?
A
8 million km2 in North Canada, Alaska and Siberia.
2
Q
How long does it have a negative heat balance?
A
8-9 months.
3
Q
Where are the conditions the most severe?
A
In the North.
4
Q
How much ice thaws in the summer?
A
Top metre of ice.
5
Q
What underlies much of the tundra?
A
Permafrost.
6
Q
For how long in the winter does the sun remain below the horizon and what are the temps?
A
Several weeks with temps of below -40ос
7
Q
What Is the biodiversity like in the south compared with the north?
A
In the south vegetation covers all surfaces but in the north it becomes incontinuous.
