I deserve this scholarship because I am going to give back to the community. Crop failure is directly caused by lack of fertility in soils, not by drought. Charles Dickens' Hard Times is a social criticism of utilitarianism Making people take tests before they're allowed to keep pets would decriminalize society in many ways.
Whether it's personal observations or scientific facts, you'll need evidence to back up your thesis statement. Take detailed notes, keeping track of which facts come from which sources. As you're researching your topic, don't ignore facts and claims that seem to disprove your thesis statement. A good essayist includes the contrary evidence and shows why such evidence is not valid.
Going with the example about crop failure above, what if you find a research study with graphs showing that every time there's a drought, there are more crop failures? Maybe all those crop failures occurred on farms that had poor soils, and unless the condition of the soils can be provided, the crop failures can't be attributed solely to drought.