(a) By completing Table 2.7, indicate which of the following list of Earth’s layers are defined seismically, and which by other means. What properties do the differences between these layers represent?

(b) Briefly outline the properties that the differences between these layers represent.

Table 2.7

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Table 2.7 How the layers within Earth are defined (to be completed). Layer How layer is defined lithosphere asthenosphere crust mantle core