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You should be able to write 1000 words in 40 min. Dont prepare more than 1200, because unless you're a crazy writting machine you'll run out of time to finish well and a strong conclusion is vital. Another way of looking at it is to write 20 x 50. (20 paragraphs of 50 words)

microbes feed off iron from the wreck forming icicle-shaped "rusticles" (35% iron, 65% bacteria, archaea and eucarya) During this 'feeding' process reduce sulfates...

Or you could have taken the reading too early Cos the pH readings tend to decrease the longer u leave the probe in..getting more n more accurate