Ais a crack in the earth's crust typically associated with, or form, the boundaries between earth's tectonic plates.

 The correct answer is:  " fault " .

  " A    fault   is a crack in the Earth's crust typically associated with, or form, the {"boundaries between Earth's tectonic plates."}.

Note that a "fault" can also be described as:

" a break in the Earth's crust along which movement has occurred."

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