Grinding quartz crystals down to produce sand is an example of a a. change of state. c. chemical reaction. b. chemical change. d. physical change.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.