| 11. | They overwinter below the frost line and return to the surface in the spring.
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| 12. | The depth of frost lines vary from region to region.
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| 13. | The frost line does not plunge to maximum depth as soon as winter starts.
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| 14. | Kepler-9b and 9c are thought to have formed beyond the " frost line ".
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| 15. | In the USA frost lines can range from around 20 " to 40 + ".
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| 16. | To construct a rubble trench foundation a narrow trench is dug down below the frost line.
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| 17. | They burrow beneath the frost line or hang out in the middle of your compost pile.
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| 18. | Frost line depths vary from region to region.
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| 19. | "They would freeze if their burrows were not below the frost line, " the scientist said.
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| 20. | I understand that having the pipes below frost line, has an effect of insulating it from cold.
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