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permafrost
9
gas hydrate
8
hydrate dissociation
8
methane emission
7
salt migration
6
Arctic shelf
5
Geology
5
QE1-996.5
5
environmental impact
4
frozen sediment
4
Arctic lakes
2
crater
2
drilling
2
gas hydrates
2
gas venting
2
geohazard
2
geohazards
2
sensitivity to temperature
2
temperature increase
2
temperature variation
2
thawing
2
Russian Arctic
1
deep gas
1
gas seep
1
intrapermafrost gas
1
permafrost degradation
1
salt chemistry
1
salt concentration
1
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