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EROSION)
Ice and Permafrost
8
Snow
8
Soil Mechanics
7
(*SOILS
6
TRANSLATIONS
6
USSR
6
FREEZING
5
MELTING
5
SOILS
5
(*PERMAFROST
4
TUNDRA
4
TERRAIN
3
(*MOUNTAINS
2
*SNOW)
2
*SOIL EROSION
2
CLIMATE
2
DEGRADATION
2
DRAINAGE
2
ICE
2
ROCK
2
TERRAIN)
2
(*AVALANCHES
1
(*TERRAIN
1
*FREEZING
1
*LANDSLIDES
1
*NEW GUINEA)
1
*SOILS
1
ABSORPTION
1
ALASKA
1
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