How do we know that the outer core of Earth is liquid?

Question:

How do we know that the outer core of Earth is liquid?

The Earth's Core:

The planet earth is divided into several layers, including the inner core, outer core, mantle and crust. Humans and all other living things are found on the crust.

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Outer Core of the Earth: Definition, Composition & Facts

from Geology 101: Physical Geology

Chapter 1 / Lesson 5
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