| 21. | The dated material consisted of a piece of exterior wood containing about 30 annual growth rings.
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| 22. | The next morning, they find an growth rings.
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| 23. | Many of the tree trunks, though only an inch thick, contain 80 or more growth rings.
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| 24. | As measured by its growth rings, one fallen tree was found to be 347 years old.
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| 25. | The age of ornate box turtles has been estimated by counting growth rings for many years.
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| 26. | Broken guards show a structure of radiating calcite fibers and may also display concentric growth rings.
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| 27. | In 1914, a pine tree with 480 growth rings was found-probably the oldest known pine in Halland.
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| 28. | Without a masthead truck, water could easily seep into the circular growth rings of a wooden mast.
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| 29. | "If you look at the fast-growing trees, typically, they don't have the growth rings during their winters,"
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| 30. | Cross section of the phalanx bones shows annual growth rings which may be used for determining age.
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