When it rained one morning, willie saw a puddle of water form in the street. in the evening the puddle was gone. the water probably disappeared by 1)evaporation 2)condensation 3)precipitation 4)expansion

1. evaporation because in the water cycle the water turns to water vapor during evaporation

The answer is 1) evaporation.

Evaporation is a phenomenon in which water turns into gaseous form without reaching its boiling point. It rather depends on other factors such as wind speed, heat, surface etc.The water could not have dissapeared due to heat as it is illogical to think of the temperature reaching its boiling point.

All the other options are illogical and hence evaporation is the correct answer.  

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”