Final answer:
Amorphous solids have a random internal structure with non-repetitive arrangements of large molecules or molecule mixtures, and include materials like candle waxes and certain forms of silicon dioxide.
Step-by-step explanation:
Amorphous solids display a random internal structure rather than a well-defined, regular and repeating pattern. Unlike crystalline solids, which have a regular three-dimensional array of particles, amorphous solids consist of large molecules or a mixture of molecules. These molecules in amorphous materials have restricted movements and do not form long-term repetitive patterns.
Examples of amorphous solids include candle waxes, composed of large hydrocarbon molecules, and certain forms of silicon dioxide, which can exist in both amorphous and crystalline states depending on the conditions during production. Amorphous solids may also transition to a crystalline state under certain conditions, but generally, these solids have no orderly arrangement and thus melt over a range of temperatures instead of having distinct melting points.