How do we know what is inside the Earth?
Our Earth has four layers. The outermost, the crust, is where all life inhabits; the mantle is hot liquid rock; the outer core is made of liquid iron and nickel; and the inner core is even denser liquid metal.
Answer and Explanation:
Geologists know what is inside the Earth because it is possible to measure the waves that are produced in the usual motion of the planet's geology. ...
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from NYSTCE Earth Science (008): Practice and Study GuideChapter 2 / Lesson 3