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(中文) 1-5認(rèn)識(shí)棱鏡
(中文) 1-6光的反射現(xiàn)象
(中文) 1-7制作一個(gè)潛望鏡
(中文) 2-1地球的表面
(中文) 2-2地球的結(jié)構(gòu)
(中文) 2-3地震的成因及作用
(中文) 2.4火山噴發(fā)的成因及作用
(中文) 2-5風(fēng)的作用
(中文) 2-6水的作用
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