Which layer is broken up into several plates which "move and float very slowly? Their very slow motion is the cause of plate tec
tonics, a process associated with continental drift, earthquakes, volcanoes, and the formation of mountains. A) inner core
B) outer core
C) asthenosphere
D) lithosphere
You would want to make sure that you have controlled the variables properly, and if you determine that you did then you would repeat the experiment to be sure of the results.