It is a hard crystalline compound of silicon and oxygen.
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Quartz is best described as a crystalline mineral composed of silicon and oxygen atoms in a specific arrangement. It is hard and has a glassy luster, and its color can vary depending on impurities.
Quartz is a poor conductor of electricity due to its crystalline structure and lack of free electrons. However, some forms of quartz, such as quartz glass, can be made conductive by adding impurities or by coating it with conductive materials.
The particles in a piece of steel are vibrating constantly due to thermal energy. At higher temperatures, the vibrations increase, causing the particles to move more. However, the particles do not change position significantly, which is why steel is considered a solid material.
Undulating.
Electromagnetic radiation.
"Event" is a term that best describes the phrase "something that happens" as it denotes a happening or occurrence at a specific point in time.