Why does the earth have a liquid outer core

Earth's Structure

As we all know the Earth has a layered architecture and the layer we see of our planet’s surface is actually the crust, which is also its thinnest layer that ranges from 5 to 70km in depth. The crust is the covering of the earth’s second layer that is the mantle. The mantle, which is also the thickest layer of earth, extends to a depth of about 2890km with pressures at the bottom of the mantle reaching as high as 140 GigaPascals. For comparison, our atmosphere has a pressure of only 0.0001 GigaPascals.

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