6. The Dust Bowl of the 1930s in the United States is a good example of

Economic depression coupled with extended drought, unusually high temperatures, poor agricultural practices and the resulting wind erosion all contributed to making the Dust Bowl. The seeds of the Dust Bowl may have been sowed during the early 1920s.

Explanation:

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its temperature is increasing. this causes molecular vibrations to increase.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added