Which of the following best describes plasma?
a - a group of supercooled particles with very low kinetic energy.
b - an ionized group of particles with low kinetic energy
c - a gas that becomes a solid without first becoming a liquid
d - an electrically charged gas with very high kinetic energy

The correct option is D.

Nowadays, scientists classified substances into four states of matter, which are: solid, liquid, gases and plasma. Plasma are hot ionized gas that is made up of equal number of positively and negatively charged ions. The ions in the plasma have very high kinetic energy which allow them to move around at high speed. Plasma is typically produce by heating gases to very high temperature.  

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dynamic equilibrium is the answer.