1.what is geoid
2. how was wood used in past
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2. It was used to make fire
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Answer: 1. Geoid is a hypothetical solid figure whose surface corresponds to mean sea level and its imagined extension under (or over) land areas.
2. Wood has been used for thousands of years for fuel, as a construction material, for making tools and weapons, furniture and paper. More recently it emerged as a feedstock for the production of purified cellulose and its derivatives, such as cellophane and cellulose acetate.
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