高中英语必修3unit4warmingup课件.ppt

Unit 4 Astronomy: the science of the stars,Science Subjects,Physics Chemistry Biology Geology Mathematics,Medicine Biochemistry Geophysics Astronomy,Astronomy is the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it.,astronomer,The Big Bang,Water Air Life,Water is the headspring of life.,?,A cloud of dust Combine into a solid ball Explodewith fire & rock (produce H2O, CO2,O2, N2, other gases),atmosphere,Cool down,water appeared,dissolve harmful gases into ,Life began,Life developed,The development of life,A cloud of dust a solid ball presence of water on the water shellfish & other fish plants begin to grow on dry land insects and amphibians appear retiles appear dinosaurs appear mammals appear,The development of life,insects and amphibians appear,retiles appear,dinosaurs appear,mammals appear,Good morning/afternoon, I am Dr. Im greatly honored to be here to give you a speech about the development of life. ,What problems have been caused by humans to the earth?,How to protect the earth and make it a better place to live on?,Design an activity on Earth Day,What the activity is about Why the activity is designed When and where to do the activity Who takes part in the activity What to be done in the activity ,Homework Search the Internet for the information of the development of l