Sublimation is the process where ice or snow changes directly into water vapor without passing through the liquid phase. This occurs in very cold, dry conditions with low humidity. In the atmosphere, sublimation is common in polar regions and on high mountain peaks, where snow “disappears” into the air despite temperatures remaining well below the freezing point. ANSWER: (B) Sublimation
What is the process called when ice turns directly into water vapor without melting? (A) Evaporation (B) Sublimation (C) Condensation (D) Deposition
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Sublimation is a vital part of the water cycle, especially in cryospheric regions. For sublimation to occur, the air must be dry enough that the vapor pressure of the ice is higher than the surrounding air. Strong sunlight and dry winds accelerate this process. A common example is “dry ice” (solid CO2) turning into gas at room temperature. In the atmosphere, sublimation helps maintain the balance of glaciers and snowpacks. The reverse process—where vapor turns directly into ice—is called “deposition,” which is how frost and snowflakes are formed directly from the air.
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