Development and Evaluation of Teaching Materials for Understanding Crystallization Differentiation

Abstract

Crystallization differentiation plays an important role in the study of earth science in high school by helping students to understand the diversity and the origins of igneous rocks. However. it is difficult for students to understand. So in order to improve their understanding. an observation lesson on crystallization differentiation was designed and put into practice with igneous rocks, specimens of zoned pluton. Students were divided into two groups: the experimental group which used a "one concept map" that described crystallization differentiation at the time of observation, and the control group which did not. Consequently, since "the concept of the classification of igneous rocks" decreased only at 5% of the rate of danger in the experimental group while "the concept of the formation process of igneous rocks" increased, it became clear that using the "one concept map" is effective. Moreover, it was suggested that the conversation of the students during their observations influences concept formation. Showing and using the "one concept map" for a short time in various scenes seems to deepen the understanding of the students.