| 21. | The frost line varies throughout the country.
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| 22. | In the USA frost lines can range from just under the surface to more than 40 inches.
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| 23. | To overcome this, breeding efforts have focused on deeper rhizomes that can survive below the frost line.
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| 24. | Differentiation between these two classes of planetesimals arise due to the frost line of the solar nebula.
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| 25. | Footings placed below the frost line will be stable because they will not be affected the freeze-thaw cycle.
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| 26. | Many others burrow deep into the soil or head for the bottom of a lake, below the frost line.
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| 27. | Other surfaces include solid matter in combinations of frost line, while closer to the sun, rock and regolith predominate.
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| 28. | The 3-foot depth is necessary to get the footings below the frost line, to prevent heaving in the winter.
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| 29. | Quaker Oats Co . expects its new Gatorade Frost line will add $ 100 million in revenue this year.
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| 30. | Finally, in tropical regions, frost line may refer to the vertical geographic elevation below which frost does not occur.
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