英语人教版必修三Unit 4 Astronomy the science of the stars 课件（3份）

课件38张PPT。Unit 4 Astronomy: the science of the starsWarming upmedicine biology chemistry astronomy physics mathematics geophysics geology physics biochemistry biology chemistryAstronomy is the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it. astronomerSolar system1.Do you know how did the universe begin?Each religion or culture has its own ideas about the beginning of the universe?Pre-readingPangu separates the sky from the earth.Pangu separates the sky from the earth Pangu separated the earth and sky with an ax. After he died, his breath became wind and cloud; his voice became thunder and his left eye sun and right one moon; arms and legs became edges and mountains; blood became rivers and tendon (筋脉) became roads; muscles became fields and hair stars; teeth and bones became metals, pearls and jade; sweat became rain. Reading How Life Began on the EarthDo you know the origin of the human beings ?Man had evolved from apes. EarthHow life began on the earthThe Big Bang waterPlants in the waterShellfish and fishPlants on landInsects and amphibiansReptiles Dinosaurs Mammals watergreen plants on land23 4How life began on the earthAnalysing 5 6 7 8forestsshellfish and all sorts of fishinsects (on land) amphibians (on land and in water) reptiles (on land) dinosaurs (on land) mammals (on land) small clever animals with hands and feet human small plants in water1A cloud of dust Combine into a solid ball Explode…with fire & rock (produce H2O, CO2,O2, N2, other gases) atmosphereCool downwater appeared dissolve harmful gases into … Life beganLife developedThe development of lifeScanning1. What was produced when the earth exploded? 2. How did water come into being on the earth? 3. Where did life first begin, on the land or in the sea? 4. Why were mammals different from other animals?1. What was produced when the earth exploded? Water vapour , carbon dioxide, oxygen, nitrogen and other gases. 2. How did water come into being on the earth? The explosion of the earth produced water vapor, which turned into water when the earth cooled down.3. Where did life first begin, on the land or in the sea? In the sea. Because water dissolved harmful gases and made it possible for life to begin. 4. Why were mammals different from other animals? Because they produced their young from within their bodies.Careful Reading Finish the comprehending on page 27Think about what you have read and make choices.Why was the earth different from other planets? A it produced a lot of heat. B.The water remained. C Water disappeared. D.It was the oldest planet.Why was life able to develop on the earth but not on other planets? A The earth had a solid shape. B. The earth did not have harmful gases in its atmosphere. C The water stayed on the earth but not on other planets. D.The earth was not too hot and not too cold.Why was it necessary for plants to grow before animals?A Animals needed plants to protect them from ... ...