Unit4 Astronomy: the science of star-Warming up & Reading教案 

How life began on the earth

Step one:  warming up

Task 1: Commom sense(常识) of science.

Physics, chemistry, biology（study of life),geology(地质学) and mathematics are science subjects. Some science subjects will study two or more of these subjects, for example,the study of physics and mathematics is astronomy(天文学).                                                

Can you understand the following combined science subjects.

1.         physics +mathematics= astronomy