Concrete reinforced with fibers (which are usually steel, glass, or plastic fibers) is less expensive than hand-tied rebar, while still increasing the tensile strength many times. The shape, dimension, and length of the fiber are important.
1. ozone hole-an area of the ozone layer (near the poles) that is seasonally depleted of ozone. hole-an opening into or through something. ozone layer, ozonosphere-a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun.ole-an opening into or through something. ozone layer, ozonosphere-a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun.
  A: Ozone is an allotrope of oxygen, with three oxygen atoms in a molecule. It is a very powerful oxidizer, and absorbs UV-B and some infrared light. Ozone is unstable and decays on its own, the decay rate being a function of temperature and time. Other compounds can accelerate ozone's decay.Ozone is formed in the troposphere (where we are) by combustion and industrial processes, and by light activating combustion products. This ozone is a component of smog. Ozone is formed in the ozone layer when oxygen molecules are shattered by absorbing UV-C from the Sun.UV-C only penetrates to about the lower stratosphere (above where aircraft fly), and this is where the ozone layer is found. A: Ozone is an allotrope of oxygen, with three oxygen atoms in a molecule. It is a very powerful oxidizer, and absorbs UV-B and some infrared light. Ozone is unstable and decays on its own, the decay rate being a function of temperature and time. Other compounds can accelerate ozone's decay.