Question

match the appropriate word to its description. water rising in the form of vapor. water condenses in the atmosphere. the water vapor is too heavy and falls back to earth. rain running down hill back into a body of water. no₂ no₃ nh₃ nh₄ :: ammonia :: ammonium :: evaporation :: condensation :: nitrate :: nitrite :: precipitation :: surface runoff

Explanation:

1. "Water rising in the form of vapor" matches "evaporation" (liquid to gas).
2. "Water condenses in the atmosphere" matches "condensation" (gas to liquid).
3. "The water vapor is too heavy and falls back to earth" matches "precipitation" (rain, snow, etc.).
4. "Rain running down hill back into a body of water" matches "surface runoff".
5. $\boldsymbol{NO_2}$ (nitrite ion is $\boldsymbol{NO_2^-}$, but here matching term is "nitrite" for $NO_2$ context? Wait, $NO_3$ is nitrate ($NO_3^-$), so:
6. $\boldsymbol{NO_3}$ matches "nitrate".
7. $\boldsymbol{NH_3}$ matches "ammonia".
8. $\boldsymbol{NH_4}$ (ammonium ion $\boldsymbol{NH_4^+}$) matches "ammonium".

Answer:

• Water rising in the form of vapor: evaporation
• Water condenses in the atmosphere: condensation
• The water vapor is too heavy and falls back to earth: precipitation
• Rain running down hill back into a body of water: surface runoff
• $NO_2$: nitrite
• $NO_3$: nitrate
• $NH_3$: ammonia
• $NH_4$: ammonium