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ice mountain snow cold winter nature landscape peak glacier arctic antarctica altitude height elevation summit top mountaintop mountain range mountain climbing mountaineering hiking trekking expedition adventure travel tourism exploration discovery research science environment climate change global warming ice age snowfall blizzard frost freeze thaw melt water iceberg glacier sea ice permafrost tundra polar arctic antarctic north south pole equator tropic altitude height elevation summit top mountaintop mountain range mountain climbing mountaineering hiking trekking expedition adventure travel tourism exploration discovery research science environment climate change global warming ice age snowfall blizzard frost freeze thaw melt water iceberg glacier sea ice permafrost tundra polar arctic antarctic north south pole equator tropic