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Hi. I’m Karl Wirth with the Geology Department, and the subject of this microlecture is evidence. We use evidence in our writing to convince an audience of the validity of a claim or thesis. A claim without relevant and reliable evidence is merely an opinion or an unsubstantiated idea. Every discipline and audience has slightly different requirements for acceptable evidence. As a Geologist, I use evidence that comes from observations of rocks and minerals such as this. Other forms of evidence include data from experiments, historical facts, the results of statistical analyses, interviews, textual evidence such as a quote from a poem, and the substantiated claims of others. Evidence should be relevant to your claim, accurate, used appropriately and properly attributed, thoroughly explained and analyzed, connected to your argument with logic and reasoning, distinguished from interpretations, and sufficient to support your claim. When you follow these simple guidelines, you will find that your thinking and your writing will improve. Remember, evidence, its the foundation of all strong arguments. Good luck, and write well.