What are the ways that heat moves?

heat moves from a cold object to a warm object.

heat only moves through air currents.

heat only moves through conduction and radiation.

heat moves through conduction, convection, and radiation.

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.