春夏秋冬四季更替,六年级学生早就习以为常。然而,它的形成原因,是很值得引导学生做些探究的。首先,要让学生搞清楚,四季变化的最本质的东西是什么。从生活经验看,四季的不同,其实就是温度的不同。四季变化就是春暖、夏热、秋凉、冬寒,依次变换,周而复始。是什么影响地球上的冷热变化呢?我们不妨设计这样一个实验:在幻灯机灯光照射下,我们转动地球仪(只有自转),观察地球(在北半球中国位置立一"小 Spring, summer, autumn and winter seasons change, sixth graders have long accustomed to. However, its formation is very worthwhile to guide students to explore. First of all, let the students know what the most essential thing about the four seasons changes. From the experience of life, the different seasons, in fact, the temperature is different. Four seasons change is the spring, summer heat, cool autumn, winter cold, followed by change, go back and forth. What influences the hot and cold changes on Earth? Let us design an experiment in which we turn the globe (with rotation only) and observe the Earth (in the Northern Hemisphere, China)