This study aims at revealing students mental models about the concept of the sun, earth and moon. To this end, a descriptive approach method; case study research design was applied. The study was conducted with the total sample of 76 students attending 7th grade during the 2010-2011 educational year. A test including 7 open ended questions was used to collect data. Analysis of the data was done by classifying them in terms of initial, synthetic or scientific models. The findings indicated that students generally have synthetic mental models. Backed with the results, it was recommended to teachers that they should take the level of reasoning and spatial ability of students into account.
Key words: Model, mental model, sun, earth, moon
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