Final answer:
The process responsible for the deposits of white frost or hoar frost is sublimation. As the temperature drops, water vapor in the air freezes onto surfaces as frost.
Step-by-step explanation:
The process responsible for the deposits of white frost or hoar frost is sublimation. Sublimation is when ice and snow change directly into water vapor without becoming liquid. As the temperature drops, the water vapor in the air freezes onto surfaces as frost.