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What is the maximum depth of permafrost?

1,5 m
15 m
150 m
1500 m
In areas of harsh winters the depth of the permafrost can be as much as 1,493 m (4,898 ft) in the northern Lena and Yana River basins. The overlying active layer that seasonally thaws is just 0.6–4 m (2.0–13 ft) thick.
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Answers by country

1,5 m
15 m
150 m
1500 m
answers
flagthe Netherlands
0%
27%
18%
54%
22
flagAustralia
8%
15%
23%
50%
60
flagRepublic of Ireland
16%
16%
16%
47%
36
flagFrance
17%
17%
21%
43%
23
flagPoland
9%
19%
28%
42%
15532
flagUkraine
12%
29%
16%
41%
24
flagGreece
0%
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33%
41%
24
flagGermany
10%
25%
27%
35%
778
flagthe United Kingdom
13%
21%
28%
34%
206
flagIndia
12%
22%
28%
34%
185
flagSwitzerland
8%
25%
32%
32%
58
flagNigeria
10%
30%
30%
30%
20
flagAustria
13%
25%
30%
29%
116
flagthe Philippines
6%
29%
35%
29%
31
flagRussia
12%
37%
20%
29%
24
flagthe United States
10%
26%
33%
28%
418
flagPakistan
3%
22%
48%
25%
27
flagItaly
22%
27%
27%
22%
18
flagCanada
14%
41%
21%
21%
55
flagUnknown
5%
35%
40%
20%
20

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1958
2007
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