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High Walls: When choosing climbers for planting against houses or high walls, the direction that they will face must be considered since climbers on shaded walls will get little direct sunshine; those on some sunny walls may get too much; and those on walls with sun for part of the day may be exposed to cold winds. The problem hardly arises with fences, since plants quickly rise above them. The soil close to house walls can be dry, and until climbers become established they may need regular watering.The second law has a more fundamental interpretation. For example, suppose a small crystal initially at room temperature is placed inside an oven that is maintained at a constant high temperature. The crystal is a highly ordered structure not in thermal equilibrium with the oven walls. By the second law of thermodynamics heat flows from the hot walls into the crystal, not in the reverse direction.
They are expensive to build but need essentially no upkeep. Walls are of especial value for supporting terraces and other places where soil must be retained. Such supporting walls may be built with cement or be dry walls made without cement. Informal groups of trees and shrubs are good as "walls" where space permits. • |
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