From this cross section of the Grand Canyon, what occurred between the formation of the Precambrian metamorphic rocks and the deposition of the lowest Paleozoic rocks? 
Definitions:
Outpatient Facility
A healthcare establishment where patients receive treatment without being admitted to the hospital for an overnight stay.
Operating Room
A specially equipped room in a hospital where surgical procedures are carried out.
Elective Outpatient Surgical Procedure
A planned surgery that does not require an overnight hospital stay, chosen by the patient and not for emergency reasons.
Vacation
A period of time spent away from home or business in travel or recreation.
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