how-life-began-on-the-earth公开课

1、Unit 4Unit 4Astronomy:the science of the starsuniverseBig Bangatomglobecarbon dioxidenitrogenwater vapouratmosphereacidchain reactionoxygenamphibianreptiledinosaurmammaltheoryformationReadingReadingHow Life Began on the EarthHow Life Began on the EarthPangu created everything except human beings.Nvw

2、a created human beings盘盘 古古女女 娲娲HOW LIFE BEGAN ON THE EARTH?Match the paragraphs with main ideas. Para. 1Para. 2Para. 3Para. 4d. The widely accepted theory about the formation of the universe.e. The formation of the earth.b. The importance of water for life.c. The development of plantsand animals on

3、 the earth.a. The arrival of humans and their influence on the earth.Para. 5Para. 1Para. 2Para. 3Para. 4Para. 5The widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plantsand animals on the earth.The arrival of h

4、umans .? No one knows exactly how the earth began, as it happened so long ago. However,according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies.Para 1 No one knows exa

5、ctly how the earth began, as it happened so long ago. However,according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies.Para 1a cloud of _ _ intoa solid _the earth_ _ w

6、as formedThe earth _ down,and _ began to appear. cooled settled globeexplodeddustwateratmosphereThe formation of the earth.Para. 1Para. 2Para. 3Para. 4Para. 5The widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of

7、plantsand animals on the earth.The arrival of humans .?Para 3 What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into oceans and seas. This produced a chain reaction, which made it possible for life to develop.主语从句主语从句科学家们相信的是科学

8、家们相信的是.Para. 1Para. 2Para. 3Para. 4Para. 5The widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plantsand animals on the earth.The arrival of humans .How?Many millions of years later Para 4NextLaterAfter that65 m

9、illion years agodevelopment？PlantsAnimals_Shellfish & fishPlants _AmphibiansForestsReptiles Dinosaurs Mammals Land animalsExtremely small Plants _InsectsPlantsAnimalsin wateron landreptiles and dinosaurs produced young by laying eggswhile mammals gave birth to young baby animals and produced milk to

10、 feed them.卵生卵生胎生胎生Para. 1Para. 2Para. 3Para. 4Para. 5The widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plantsand animals on the earth.The arrival of humans and theirinfluence on the earth .what? But they are

11、 not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. Para 5 So _life will continue on the earth for millions of years to come will depend on_this problem can be solved.whetherwhetherDiscussion:The earth may become too hot to live on. Discuss in groups of four :How to solve the problem-global warming? Global warming has, in its tur