c.1300, impose a tax on, from Old French taxer impose a tax (13c.), from Latin taxare evaluate, estimate, assess, handle, also censure, charge, probably a frequentative form of tangere to touch (see tangent). Sense of burden, put a strain on first recorded 1670s; that of censure, reprove is from 1560s.
The average depth of frost penetration ranges from 25 inches (64 cm) in southwestern South Dakota to 50 inches (127 cm) in. the northeast. Depth of frost depends on the amount of residue cover, soil moisture content, and the amount and timing of. snowfalls in relation to temperature extremes.
An air frost occurs when the air temperature falls to or below the freezing point of water. An air frost is usually defined as the air temperature being below freezing point of water at a height of at least one metre above the ground. ground frost refers to the formation of ice on the ground, objects or trees, whose surface have a temperature below the freezing point of water.