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  1. Cottonwood and Balsam Poplar | Geophysical Institute

    Jul 11, 2025 · While poplar may grow to 100 feet high and two feet across, cottonwood can reach to 125 feet and be much larger in diameter. Cottonwoods three feet in diameter at breast …

  2. Northern Tree Habitats - Geophysical Institute

    Jul 11, 2025 · They examined the present range of lodgepole pine and decided that the tree could survive in interior Alaska if given a chance. Lodgepole pine grows from southern California to …

  3. Witches' Broom - Geophysical Institute

    3 days ago · 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. Feltleaf willows: Alaska’s most abundant tree

    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 …

  5. Burls - Geophysical Institute

    Jul 11, 2025 · Since the hardness of the wood is related to the rate of growth, the wood inside a rapidly growing burl is softer than the wood elsewhere in the tree. Nevertheless, it is hard …

  6. More on Why Tree Trunks Spiral - Geophysical Institute

    Jul 11, 2025 · 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 …

  7. 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 …

  8. 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 …

  9. Mummified forest tells tale of a changing north

    Jan 6, 2011 · The mummy trees of northern Ellesmere Island include a trunk of a pine tree four feet long and six inches in diameter. Each of the trees was at least 75 years old when it died. …

  10. The secret life of red squirrels - Geophysical Institute

    Nov 27, 2024 · He has often returned to the forest floor knowing if a ball of twigs and moss within the tree contained newborn red squirrel pups. Over the years, those squirrels have taught …

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