Unit 1 Our living planet Extended Reading 课件-2021-2022学年高中英语牛津译林版（2020）选修第一册

B8U1 Extended Reading Inside the Earth BY G.Z BY ZYH 1 Inside the Earth BY ZYH Inside the Earth Have you ever wondered _______ lies beneath your feet? I don’t mean the floor of your apartment, ____ the pavement you walk ____, but rather what the Earth is actually made ____. ___________ (unfortunate), we cannot crack the Earth open like an egg, so much of what scientists know about the Earth’s internal structure _________(base) on analyzing earthquake waves. ________(find) out more about the Earth’s make-up, scientists have drilled very deep holes _____ none have reached the mantle as yet. The intense pressure and heat inside the Earth can close up a deep hole or break a drill. Choosing the right place to drill is also not easy. _________, within a few years, scientists are hoping to drill into the mantle, _________ will help us better understand the geology of the Earth. what on Unfortunately is based To find However which or of but BY ZYH Inside the Earth __________(study) the ins