Deposition refers to the process where a gas transforms directly into a solid without passing through the liquid state. Therefore, the correct answer from the options given is:
- B) gas rightarrow solid
This process is the opposite of sublimation, where a solid changes directly into a gas. An everyday example of deposition is the formation of frost on cold surfaces, where water vapor in the air turns directly into ice. Understanding the process of deposition is important in fields like meteorology and material science.