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  1. Cottonwood and Balsam Poplar | Geophysical Institute

    11 Noll 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

    11 Noll 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. The majesty and mystery of Alaska yellow cedar | Geophysical …

    23 Iúil 2021 · A tree near one of our campsites had a crack at its base through which we could pass the folded saw. Yet the tree was still alive, with just one rope of cambium — the outer bark …

  4. The largest black spruce in Alaska | Geophysical Institute

    16 Lún 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 …

  5. Tree Rings and History | Geophysical Institute

    11 Noll 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 growing …

  6. The secret life of red squirrels | Geophysical Institute

    27 Samh 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 …

  7. Vanasuma: A book on common wildflowers in and around …

    The book, VANASUMA will be a record of the wild flowering trees in and around the National Park in Kannada, which will serve as a field guide as well – with high quality pictures and detailed …

  8. The American robin returns on time | Geophysical Institute

    22 Beal 2025 · American robins have returned to northern Alaska. A male is now perched above me in a balsam poplar tree on this bench of well-drained land upon which sits the University of …

  9. Trees as Earthquake Fault Indicators | Geophysical Institute

    11 Noll 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. Witches' Broom | Geophysical Institute

    11 Noll 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 …