The purpose of this study was to provide class materials that enable junior high school students to perceive the scale of long-term geological changes using the mechanism of plutonic rocks visible on the earth’s surface. This class has been taught in the science unit of junior high school under the section name “The Composition of and Changes in the Earth.” To achieve this, we first conducted a literature review on the solidification depth of plutonic bodies exposed at the surface in Japan. The review revealed 39 related articles with solidification depths of plutonic bodies ranging from 2 to 27 km. Next, we conducted a class on the mechanism of plutonic rocks visible on the earth’s surface, using familiar plutonic rock with elucidated solidification depth. The result of the class revealed that at least 10% of students, while holding an accurate understanding, could comprehend the scale of long-term geological changes.
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