Most people notice them in well-lit rooms or outdoors on a bright day. Often floaters are normal, but sometimes they're a sign of a more serious eye problem, such as retinal detachment, especially if you also see light flashes or a dark shadow come across the edge of your vision.
A Composite material (also called a composition material or shortened to composite, which is the common name) is a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components.
Silicon is a chemical element. It is not generally found by itself but as a part of chemical compounds. Silica is silicon dioxide, a particular chemical compound that contains silicon. However, silica is not particularly bioavailalble. The silicon compound that's bio available when taken as a supplement is orthosilicic acid.