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  1. Cottonwood and Balsam Poplar | Geophysical Institute

    Jul 11, 2025 · The Klukwan giant holds the national record for black cottonwood diameter. Its nearest rival, a tree near Salem, Oregon, does hold the national height record. The Klukwan …

  2. Northern Tree Habitats - Geophysical Institute

    Jul 11, 2025 · Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian …

  3. Witches' Broom | Geophysical Institute

    Jul 11, 2025 · Witches' broom on spruce trees is caused by a rust disease (a kind of fungus disease). The rust lives on the spruce tree throughout the year. Each spring, small yellow …

  4. Tree Rings and History | Geophysical Institute

    Jul 11, 2025 · 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 …

  5. The majesty and mystery of Alaska yellow cedar

    Jul 23, 2021 · Probably because of chemical compounds within the tree like nootkatin that emit the pleasant odor and tint the wood yellow, Alaska yellow cedar endures like no other tree in …

  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 …

  7. The largest black spruce in Alaska | Geophysical Institute

    Aug 16, 2010 · The tree leans uphill, and its trunk is 45 inches around. When I hugged it, I could barely clasp my hands together. The largest black spruce in Alaska is a lucky tree, because its …

  8. Burls - Geophysical Institute

    Jul 11, 2025 · Burls, spherical woody growths on the trunks of spruce, birch and other trees, are commonly found throughout wooded parts of Alaska.

  9. Trees as Earthquake Fault Indicators | Geophysical Institute

    Jul 11, 2025 · Then using tree ring dating methods, it may be possible to date earthquakes occurring before historical records were kept. The ability to identify and date very large …

  10. 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 …

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