Identifying Effective Topic Sentences: A Guide with Examples

Best TS: 'd. Ancient people observed and recorded lunar and solar events in different ways.' Too general: 'a. The history of astronomy is interesting.' Too specific: 'b. Ice age people recorded the appearance of new moons by making scratches in animal bones.' Incomplete: 'c. For example, Stonehenge in Britain, built 3500 years ago to track the movement of the sun.'