Scientists have established that some of the layers of earth are solid, some are liquid, and some are semi-fluid. explain how the scientists are able to determine the liquid and solid layers. use at least two pieces of evidence to support your answer.

i think by using waves we can determine the layers of the earth

Explanation:

seismic waves can b sent thru the earth then we study how it moves since it can speed up, bent Nd even slowed down, when it speeds up we can its solid since waves moves faster in solids, bent nd slowed down then we can say it changed medium thereby meaning liquid or fluid part of the earth

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