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自然常识课本第五册18课《怎样认识物体(五)——岩石》是专业性很强的课。在准备这节课的教学时,我碰到的第一个难题是:书上列举的八种岩石,学校岩石标本中只有二、三种。我想方设法借到了一套品种比较齐全,岩石的相位比较好的标本,这就为学生观察、认识提供了极好的条件。岩石的特性与岩石的形成是有着内在联系的,这是一条认识岩石特性的规律。教学中我将教材作了一些变动,把后面的课文中有关岩石的形成部分提前放在这一课中教学。根据岩石的成因不同把书上的八种岩石分别归入火成岩(岩浆岩)、水成岩(沉积岩)、变质岩三类之中去。这样学生对岩石内部结构和特性的认识不再是停留在表面上或个别的岩石上,而是纳
Natural Science Textbook Volume 5, Lesson 18, “How to Understand Objects (5) - Rocks” is a highly specialized course. The first difficulty I encountered when preparing for the teaching of this lesson was that there were eight types of rock listed in the book and only two or three of the rock specimens were in school. I tried my best to borrow a set of specimens of relatively complete variety and relatively good phase of the rock, which provided excellent conditions for students to observe and understand. The characteristics of rock and rock formation are intrinsically linked, which is a rule of understanding of rock characteristics. In teaching, I made some changes to the teaching materials, teaching the formation of rock in later texts in this lesson. According to the different causes of the rocks, the eight types of rocks in the book are respectively classified into igneous rocks (magmatic rocks), igneous rocks (sedimentary rocks) and metamorphic rocks. In this way, the students' awareness of the internal structure and characteristics of the rock no longer rests on the surface or on individual rocks, but rather