D. 28. What is the definition of GLASS? a. A hard, amorphous, transparent material made by heating a mixture of sand and other additives b. The change in direction of light as it changes speed when moving from one substance into another c. Without shape or form applied to glass, it refers to having particles that are arranged random instead of with a definite pattern d. A ratio of the mass of an object to its volume e. The chemical formula for silica (SiO_(2)) Di) b Di) d o C

The correct answer is a. A hard, amorphous, transparent material made by heating a mixture of sand and other additives.<br /><br />Glass is a hard, amorphous, transparent material that is made by heating a mixture of sand and other additives. The other options provided do not accurately define glass. Option b describes refraction, option c describes the amorphous nature of glass, option d describes density, and option e describes the chemical formula for silica, which is a component of glass but not the definition of glass itself.