2. Put the stone in the middle of the bubble chart (activity manual) and guide students to observe and describe it with the help of the bubble chart: first, show specific examples to see how others describe the stone; Then abstract to the level of characteristics, such as yellow, which is actually the color of stone, and so on; Finally, I went back to my own stones, observed and described my own stones one by one among many features, and recorded them in the activity manual by drawing, writing and pinyin.

3. First, study in groups. The leader of the mountain organized a group, put a stone in the big circle in the center of the picture and asked the observer: what color is this? What's the mark? Ask the observer to answer; Students will observe the method in person after they know it clearly.

4. After the observation, organize students to communicate with each other in the group, and then communicate with the whole class when they are ready.

5, tidy up the equipment, tidy up the desktop, precautions: describe the stone in scientific language, which is a difficult point for first-grade children and needs the help of teachers; Teachers can provide corresponding graphics cards, color cards, vocabulary cards, etc. According to the actual situation of students as a learning scaffold, so as to help students better describe the characteristics of the stones they observed.