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  1. More on Why Tree Trunks Spiral - Geophysical Institute

    Feb 26, 2026 · One tree, of course, proves nothing. "But why should the tree spiral? More speculation here: Foliage tends to be thicker on the south side of the tree because of better sunlight. Prevailing …

  2. Northern Tree Habitats - Geophysical Institute

    Feb 26, 2026 · Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian forests have all …

  3. Tree Rings and History | Geophysical Institute

    Feb 12, 2026 · A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows. Annually, the tree adds new layers of wood which thicken during the growing season …

  4. Feltleaf willows: Alaska’s most abundant tree | Geophysical Institute

    May 25, 2023 · The most plentiful moose food in the state — and probably Alaska’s most numerous tree — is the feltleaf willow, which was once called the Alaska willow. As its name implies, the feltleaf …

  5. Pollen season arrives, blame the trees | Geophysical Institute

    May 7, 2008 · The airborne invaders are grains of tree pollen, specks so small that it would take eight of them to cover the period at the end of this sentence. The air is rich with pollen because spring is the …

  6. The Turkey and the Tambalacoque Tree - Geophysical Institute

    Nov 14, 1990 · The problem was the decline of the tambalacoque tree, a once common and useful source of timber for the island residents. Only thirteen of the trees remained, and they were sickly …

  7. Visit to an exotic tree plantation in Alaska | Geophysical Institute

    Jun 18, 2021 · The two-acre exotic tree plantation is part of a much-larger “boreal arboretum” on the UAF campus, which mostly consists of native spruce, birch, aspen, poplar and willow trees. Having …

  8. The secret life of red squirrels | Geophysical Institute

    Nov 27, 2024 · Stan Boutin has climbed more than 5,000 spruce trees in the last 30 years. He has often returned to the forest floor knowing if a ball of twigs and moss within the tree contained newborn red …

  9. Skinny Trees and Paleoforests - Geophysical Institute

    Jun 20, 1990 · However, a tree growing in the long-gone warm Arctic wouldn't look like a tree growing in the ancient temperate zone. Even then, a high-latitude tree would probably be skinny, like the …

  10. Kannada pocket guide for Common Avenue trees of Karnataka

    A citizen friendly pocket-sized book in Kannada describes commonly found avenue trees, filling the paucity of such resources in the local language while also