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CLASSIFICATION
MOUNTAINS
Ice and Permafrost
5
Snow
5
TERRAIN
5
ARCTIC REGIONS
4
RIVERS
4
CLIMATE
3
DRAINAGE
3
ECOLOGY
3
GEOMORPHOLOGY
3
GLACIERS
3
ICE
3
PLANTS(BOTANY)
3
SOILS
3
VEGETATION
3
AGRICULTURE
2
CONSTRUCTION
2
Cartography and Aerial Photography
2
DISTRIBUTION
2
ENVIRONMENTAL IMPACT
2
Ecology
2
FORESTS
2
FREEZING
2
GRASSLANDS
2
IDENTIFICATION
2
LAKES
2
MAPS
2
MELTING
2
OBSERVATION
2
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