The energy to form plasma comes from which of the following sources?
a. the movement of particles
b. attractive forces between particles
c. the shape of the plasma
d. heat or electricity in the atmosphere

By definition, a plasma is actually the fourth state of matter. It is a hot ionized gas that consist of equal number of protons and electrons. To create plasma, you need an external source which contains very high energy to ionize the gas. That could be in the form of laser. As long as it has high energy, that would be a viable source. Therefore, the answer is D.

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