1 Cut a medium sized onion into small (~5 mm) segments. 2  Weigh out 100 grams of the onion and place into a 600 mL beaker. 3  Cover the onion with the solution prepared in step 1. 4  Put the beaker in a 65 C hot water bath for 15 minutes, pressing the chopped onion mixture against the side of the beaker with the back of a fork. When dissolved, add 75 mL of distilled water to make the extraction solution. 2  Avoid frothing. 3  Cut a medium sized onion into small (~5 mm) segments. 4  Weigh out 100 grams of the onion and place into a 600 mL beaker.
2010 Census Urban and Rural Classification and Urban Area Criteria. The Census Bureauâs urban-rural classification is fundamentally a delineation of geographical areas, identifying both individual urban areas and the rural areas of the nation.
The key is to use a rural-urban definition that best fits the needs of a specific activity, recognizing that any simple dichotomy hides a complex rural-urban continuum, often with very gentle gradations from one level to the next.