Here's why:
* Sublimation: A solid directly changes into a gas, skipping the liquid phase (like dry ice turning into carbon dioxide gas).
* Deposition: A gas directly changes into a solid, also skipping the liquid phase.
Think of it like a reverse sublimation. Examples of deposition include:
* Frost formation: Water vapor in the air directly changes into ice crystals on a cold surface.
* Snow formation: Water vapor in the clouds directly changes into solid snowflakes.