Examlex
Which of the following statements is true of the social class system in the United States?
Salt
A mineral composed primarily of sodium chloride (NaCl), used in cooking and preserving food, and is essential for human health in small amounts.
Sound Waves
Sound waves traveling across air or any other form of matter, heard once they connect with a person's or an animal's auditory system.
Hertz
A unit of frequency in the International System of Units (SI) that measures the number of cycles per second of a periodic phenomenon.
Frequency
The rate at which a periodic event occurs, such as the number of complete cycles per second in a wave or the number of times a behavior is observed in a given period.
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