<span>c. a hot tub full of hot water</span>
Answer: i think c
Explanation:QA: “What is ordinary glass made of ?”
Glass is mostly silica, or silicon dioxide, present as quartz in many types of sand. Pure silica forms a highly transparent glass, but has a very high melting or softening temperature, around 1700°C. Even at such high temperatures it is highly viscous and difficult to work. Its use is largely confined to applications requiring high transparency to ultra-violet and infra-red radiation, stability at elevated temperatures or low thermal expansion coefficient.
“Ordinary glass” windows and drinking vessels are typically made from soda-lime glass, containing silica with around 25% sodium, calcium and other oxides, which together reduce the softening temperature to roughly 500–600°C
Saturated fatty acid, i think
Light always travels in a straight line when going through a single medium, any substance through which a light wave can travel. In some mediums, such as air, light travels quickly. ... Heat, light and sound are similar to each other. They are forms of energy and they travel in waves.
