The most accurate statement that describes the atmosphere is:
C. The atmosphere is composed of masses of air particles that are constantly circulating.
This statement reflects the dynamic nature of the atmosphere, where air particles are in constant motion due to various factors such as temperature, pressure differences, and the Earth's rotation.
To clarify the other options: A. While nitrogen and oxygen are the primary components of the atmosphere, they do not directly react to form ozone in a simple way; ozone is formed through a complex series of reactions involving ultraviolet light.
B. The atmosphere is composed of several layers, but density actually decreases with altitude, not increases.
D. This statement is inaccurate because air particles in the atmosphere are in constant motion, rather than moving very little.