人教版必修三Unit4Astronomythescienceofthestars[全套课件].ppt

Unit 4 Astronomy: the science of the stars;How Life Began on the Earth;Science Subjects;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. ;The Big Bang ;The Solar system ;;Water Air Life ;A cloud of dust Combine into a solid ball Explode…with fire rock (produce H2O, CO2,O2, N2, other gases) ;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; Good morning/afternoon, I am Dr…. I’m 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;Homework Search the Internet for the information of the development of life. 2. Read and learn good words, phrases or structures from Reading. ;Period 2 Using Language Reading Task;the natural force that causes an object to move toward the centre of the earth. ;Isaac Newton; I heard about how three men made mistakes when they tried to describe gravity. I heard about how three men wanted to find out about the beginning of the universe. I heard about how the idea of gravity has developed over a long period of time. I heard about three scientists and their work. ;;A visit to the moon;On the moon;Last month I visited the moon with my friend. Before we left, I was told the force of g_____ would change three times on our journey. Then we took off. As we left the earth, I became very h_______. Gradually the weight l_______. When I was in space, it d__________. We f_______ weightlessly in the cabin and I c_____ ___. When I was on the moon, I was surprised to find out even walking needs l