| 1. | That results in boards with the annual rings mostly perpendicular to the faces.
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| 2. | The resulting planks have different annual ring orientations when viewed from the end.
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| 3. | Protection is stronger at the boundaries where annual rings meet.
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| 4. | It has been dated by drilling a core sample and counting the annual rings.
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| 5. | "Porites " growth rates can be determined by examining annual rings in their skeleton.
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| 6. | No definite relation exists between the annual rings of growth and the amount of sapwood.
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| 7. | But we, unlike trees, need grow no annual rings.
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| 8. | The " annual rings " are clearly recognizable.
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| 9. | I did not grow a new annual ring.
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| 10. | The annual rings of growth are for many years quite wide, but later they become narrower and narrower.
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