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ANTARCTICA
6
CONTINENT >
6
EARTH SCIENCE
GEOGRAPHIC REGION >
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POLAR
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SHIPS
oceans
6
AQUATIC ECOSYSTEMS
4
BIOLOGICAL CLASSIFICATION
4
BIOSPHERE
4
CRYOSPHERE
4
ICEBERGS
4
MICROALGAE
4
OCEAN >
4
OCEAN TEMPERATURE
4
PLANKTON
4
PLANTS
4
SEA ICE
4
SOUTHERN OCEAN
4
WATER TEMPERATURE
4
biota
4
AMD
3
AMD/AU
3
CEOS
3
ACE/CRC
2
AMMONIA
2
ANIMALS/INVERTEBRATES
2
ANIMALS/VERTEBRATES
2
ANTHOZOANS/HEXACORALS
2
ARTHROPODS
2
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