Filters do not remove all the contaminants from water. beat a dead horse: to argue on issue that is already settled; waste time doing sth [口]重提早已解决了的问题, 马后炮, 炒冷饭, 白费口舌, 浪费精力 plate: Geology In the theory of plate tectonics, one of the sections into which the ...
* read about and discuss the theory of plate tectonics; * map the regions of the United States that are most susceptible to earthquakes and those that have volcanoes; * list the states that lie on plate boundaries; * look at a population density map and explain if people avoid living in ...