,时间是什么？歌曲：王铮亮时间都去哪儿了-_标清.kux,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,时间是物质存在的客观形式，无处不在，与每个人密切相关，但它看不到、触不着。,记录时间的工具,还有什么可以记录时间的更替？,8时间的脚印,了解岩石记录时间（历史）的相关知识，掌握本文说明顺序中的逻辑顺序。（重点）明确说明对象，理清文章思路；体会本文生动有趣的语言。（难点）认识岩石记录时间的功能，培养学生的探索意识和科学精神。（重点）,学习目标,陶世龙（1929），四川安岳县人，我国著名科普作家。代表作品有打开地下宝库的钥匙揭开大地的秘密地球的画像火山和地震多变的地球等科普读物。,作者简介,本文选自时间的脚印（江苏教育出版社1999年版）。科普作家陶世龙毕业于北京大学地质系，参加工作后长期与地质学科打交道，在国家推动科学普及和科学大众化的倡导下，作者致力于科普写作，尤其是针对青少年的科普作品较多。这篇科普文章以记录时间的方式为切入点，向我们介绍了有关岩石的丰富而有趣的科学知识。,背景链接,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,踪迹（）腐蚀（）浑浊（）山麓（）粗糙（）龟裂（）帷幕（）刨刮（）沟壑（）楔形（）钟鼎文（）海枯石烂（）,zn,jn,co,sh,wi,bo,h,l,zhu,xi,dn,k,字词学习,词语解释,腐蚀：通过化学作用，使物体逐渐消损破坏；人在坏的思想、行为、环境等因素影响下逐渐变质堕落。(本文用义项)浑浊：(水、空气等)含有杂质，不清洁、不新鲜。海枯石烂：海水干涸，石头粉碎。形容经历久远的时间。多指意志坚定，永不改变。龟裂：裂开许多缝子。,胶结：半流体干燥后变硬黏结在一起。钟鼎文：古代铜器上铸的或刻的文字，通常专指殷周秦汉铜器的文字。甲骨文：古代刻在龟甲和兽骨上的文字，内容多是殷人占卜的记录，现在的汉字就是从甲骨文演变下来的。楔形文字：公元前三千多年美索不达米亚南部苏马连人创造的文字，笔划像楔子，古代巴比伦人、亚述人、波斯人等都曾使用这种文字。,本文的层次结构,课文讲解,快速通读课文，找一找：文中有些段落只有一句话但起着承上启下的作用。请找出几个这样的例子，并作简要分析。,5、7、18、22、24、27,1.岩石是怎样记录下时间的呢？（5）,承上启下，由人类记录时间的方式，引出岩石记录时间方式的探寻。,2.真的有“海枯石烂”的时候。（7）,开启下文，说明岩石“毁灭”的过程。,3.经过长期的重压和胶结，那些碎石和泥沙重新形成了岩石。（18）,总括上文，总结了岩石“毁灭”之后再度“新生”的过程。,4.岩石保存了远比上面所说的多得多的历史痕迹。（22）,承上，收住有关岩石自身解体与新生的话；启下，解读下文有关岩石上的历史痕迹。,5.从“死”的石头上，我们看到了地壳的活动。（24）,概括评价上一段的叙述内容。,6.化石是历史的证人，它帮助我们认识地球历史的发展过程。（24）,承上文，化石的作用；启下文，说明化石是怎样帮我们认识地球历史的发展过程的。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,自由读课文，思考：课文主要介绍分析岩石记录时间的奇异功能，为什么不直接进入正题，而要先引用高士其的话？,课文精讲,时间伯伯，你是最伟大的旅行家，你从不犹豫你的脚步，你走过历史的每一个时代。高士其时间伯伯,引用高士其的话把时间拟人化，一方面与主题照应，另一方面，通过引用，由生活时间引入地质时间，更切合读者实际生活，吸引读者。文题“时间的脚印”实际上是“从岩石上，可以看到时间的长短”的意思。,自由读1-5自然段，说一说：1.现在的人们是怎样记录时间的？,钟表和日历,2.中国古代用什么来记录时间？,铜壶滴漏,3.本文中提到的岩石有什么作用？,它是大自然用来记录时间的。,铜壶滴漏,水从一个铜壶缓缓地滴进另一个铜壶，时间过去了，这个壶里的水空了，那个壶里的水却又多了起来。时间是看不见的，但是我们用水滴记下了逝去的时间。,小知识,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,自由读6-21自然段，分组讨论：1.岩石的运动规律是什么？,被破坏,被搬运、被堆积,重新生成岩石,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2.你能根据书上的有关内容概述石烂到新生的过程吗？,岩石,小石子,沙砾、泥土,新岩石,沉淀,重压,胶结,3.人们是怎样根据岩石来判断时间的？（重点读第19自然段）,可从岩层厚度、排列顺序、地壳运动等方面思考。岩层厚度：1米厚（300010000年）；排列顺序：最早形成的躺在最下面；地壳运动：平卧的岩层变得歪斜甚至直立。,自由读22-29自然段，分组讨论：1.岩石是怎样保存历史痕迹的？,可从岩石结构、石头颜色、生物化石等方面去考虑。岩石结构反映地壳的活动石头颜色反映远古的气候生物化石反映历史的发展,2.岩石保存了哪些历史的痕迹？,地壳的活动；气候的变化；古代生物的状况；地球历史的发展过程；自然界转瞬即逝的活动。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状