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This is what I write about if the PSSAs tell me to write an informative or explanatory essay.
What is I teach the reader about a topic? I include words like, "first you..." "next you..." "then..." and "finally you..."
Give steps in order. YOU are the EXPERT! Pretend that the reader doesn't know anything about your topic. Give details about what you see, hear, feel, or touch. Use your 5 senses!