here are all of the misspelled words I found in the standardized test responses I've graded today: temperature, plant, environment, receive, amount, watt, bulb, height, intensity, water (?!), wattage, different, exposure, beginning, carbon and location.
And those are pretty much par for the course. I know that we each have words we consistently spell wrong, and there's a chance I'm grading answers from ESL students, but when I see the same mistakes every day, the ignorance becomes worrisome.
ETA: All of these responses are from high school students. Yikes.