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frost line

   Also found in: Dictionary/thesaurus, Financial, Wikipedia 0.01 sec.
frost line [′frȯst ‚līn]
(geology)
The maximum depth of frozen ground during the winter.
The lower limit of the permafrost.
(materials)
In polyethylene film extrusion, a ring-shaped area with a frosty appearance at the point where the film reaches its final diameter.

frost line
An imaginary line indicating the depth of frost penetration in the ground.


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A winter leachate distribution system was then developed by laying "drip tubing" below the frost line, allowing for year round distribution.
Woodchuck tunnels normally are deep - just below frost line - and about 40 feet long, complexly dug with several amenities, including chambers analogous to a baby room, bathroom and bedroom.
A Roman-style footer In reading up on Roman architecture we learned that the Romans created their footers, (underground foundations for the above-ground structures they built), by digging down below the frost line and by throwing "rubble" (chunks of stone) into the hole.
 
 
 
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