This article studies the conceptions of the interior of the Earth held by Portuguese elementary school children and senior citizens. Several studies were conducted regarding conceptions related to Earth sciences, such as rocks, minerals, earthquakes geological time, and Earth structure. Most of these studies involved students enrolled in compulsory education, some involved higher education students, several involved teachers, and only a few involved adults. The majority of the results showed that many misconceptions are held by people of all ages. Similar (...) results were found in this study, as both children and senior citizens revealed several misconceptions. The research resorted to a questionnaire based on a drawing task so as to find out the way that children and senior citizens imagine the structure and composition of the interior of our planet. A comparison between children’s and senior citizens’ drawings was made, as well as a comparison between those drawings and the historical models of the internal structure of the Earth. We found that only a small number of children and even a smaller number of senior citizens recognize that the interior of the Earth is organized in concentric layers. They assume that soil and water are a common part of the internal composition of our planet. Similarities between the drawings and the historical models were identified, particularly similarities related to Gautier’s model, which accepts the possibility of the existence of life in the interior of the planet as it happens on its surface. (shrink)

Physics textbooks often present items of disciplinary knowledge in a sequential order of topics of the theory under instruction. Such presentation is usually univocal, that is, isolated from alternative claims and contributions regarding the subject matter in the pertinent scientific discourse. We argue that comparing and contrasting the contributions of scientists addressing similar or the same subject could not only enrich the picture of scientific enterprise, but also possess a special appealing power promoting genuine understanding of the concept considered. This (...) approach draws on the historical tradition from Plutarch in distant past and Koyré in the recent history and philosophy of science. It gains a new support in the discipline–culture structuring of the physics curriculum, seeking cultural content knowledge of the subject matter. Here, we address two prominent individuals of Italian Renaissance, Leonardo and Galileo, in their dealing with issues relevant for introductory science courses. Although both figures addressed similar subjects of scientific content, their products were essentially different. Considering this difference is educationally valuable, illustrating the meaning of what students presently learn in the content knowledge of mechanics, optics and astronomy, as well as the nature of science and scientific knowledge. (shrink)

It is well-documented that children do not begin school as blank slates but that they bring with them extensive knowledge about how the world around them works. This conceptual knowledge, embedded within rich theoretical structures, is not always accurate and requires change through learning and instruction. Yet some ideas – such as object motion – appear to be particularly resistant to such change. So how can conceptual change be achieved or facilitated? Collaboration, for one, has long been recognised as a (...) beneficial learning and teaching approach, including early science education. However, for deep-rooted ideas collaborating with others may not always have the desired impact. Instead, the notion of self-collaboration is considered in this review. The current state of research in the field of predictive and underlying knowledge in childhood is outlined and different models of how the knowledge systems relate to each other are discussed. While further work is still needed to establish a clearer picture of how self-collaboration might effect conceptual change, research to-date clearly identifies significant differences between predictive and underlying knowledge structures throughout childhood, how these structures can be related to traditional conceptual change theories, and how they may play a role in future learning and instructional approaches. (shrink)