(Layman Science Series) Week 4 - How is the earth's magnetic field created?

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Intro
I am trying to post a science/physics question of varying difficulty each week for this year.

The Rules are:
Answers must be complete, and each statement must be sound/logical.
The better the answer, then the more points awarded. Answers can always be updated at anytime as
we learn something new everyday.
The greater the difficulty, the greater the points. I will give an answer at end of week. Repeating my
answer awards no points, you will have to come with a better or alternate answer.

Question
How is the earth's magnetic field created?

Difficulty
Tertiary/College Level Physics
Tertiary/College Geology

Site share of the week
Up and Atom - YouTube
https://www.youtube.com/channel/UCSI...2TiviLQn4fSHaw

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Added research