Solve the riddle:
I shift around, though always slowly.
I never move more than a few inches at a time.
A large movement by me can kill many people.
I am huge, yet unseen by humans.
What am I?

Below you will find a hint and the correct answer to the riddle.
Little hint:
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Hint: T*ct*nic pl*te
Right answer:
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Answer: A tectonic plate.