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summer(14)
winter(6)
forests(5)
grasslands(4)
seasons(4)
climate change(3)
habitats(3)
paleoclimatology(3)
water resources(3)
deserts(2)
ecosystems(2)
grasses(2)
lakes(2)
photosynthesis(2)
pines(2)
pollen(2)
radii(2)
spring(2)
surface temperature(2)
trees(2)
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