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.
The ozone is so thin in this part of the world that the weather report on the nightly news includes five-minute sunburn alerts. Ozone is Earth's natural sunscreen. The ozone layer in the upper atmosphere, or stratosphere, absorbs harmful ultraviolet rays from the sun.In the 1980s, scientists discovered that manmade chemicals destroy ozone to the point where an actual ozone hole occurs.The good news is that this hole isn't getting any larger.he ozone is so thin in this part of the world that the weather report on the nightly news includes five-minute sunburn alerts. Ozone is Earth's natural sunscreen. The ozone layer in the upper atmosphere, or stratosphere, absorbs harmful ultraviolet rays from the sun.