Which of the following is an example of a physical change?
evaporation in a swamp cooler
electricity produced by a dry cell
digestion of a hamburger
rusting of a car body

evaporation in a swamp cooler

Explanation:

Evaporation in a swamp cooler simply involves the conversion of water in the liquid state to water in the gaseous state. It is an easily reversible process if the vapour can be collected and condensed. A chemical change involves the formation of a new substance and is not easily reversible. It is a chemical reaction. A dry cell operates by a chemical change which produces voltage in the cell. Digestion involves a series of irreversible chemical reactions catalysed by enzymes. Hence the answer.

Students may choose from a variety of issues, including desertification, pollution, drought, famine, racism, gender inequality, disease, healthcare, welfare, education, unemployment, taxation, economic problems, terrorism, war, political organization, city planning, etc. Unemployment is an issue many societies face. It becomes especially challenging during times of economic hardship. Governments often create public works programs to increase the number of jobs in the economy. Other options include stimulus packages designed to help put money back into the economy or to help private industries create more jobs.

Explanation: