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Which trees are very shallow rooted?

oak
birch
willow
Siberian larch
In Sibrerian Taiga permafrost occurs and restricts root growth. Trees are therefore prone to windfall.
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Answers by country

oak
birch
willow
Siberian larch
answers
flagBelarus
6%
20%
6%
66%
15
flagGermany
7%
10%
15%
64%
65
flagSwitzerland
0%
0%
36%
63%
11
flagUkraine
1%
14%
26%
57%
69
flagPoland
8%
18%
21%
51%
14269
flagthe United Kingdom
11%
13%
27%
45%
72
flagRussia
4%
20%
27%
43%
44
flagCanada
5%
26%
21%
42%
19
flagUnknown
40%
10%
10%
40%
10
flagAustria
6%
18%
31%
37%
16
flagIndia
17%
16%
30%
34%
178
flagthe United States
14%
19%
34%
30%
258
flagthe Philippines
31%
18%
25%
25%
16
flagAustralia
0%
33%
41%
25%
12
flagPakistan
36%
9%
36%
18%
11

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oaks
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This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

the soil
meteorite
low sun position
the wind

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smallpox
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cholera
typhus