Question

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it takes a continent approximately 250,000,000 years to move half - way around earth, a distance of about 19,200 km or 1,920,000,000 cm. the speed of the continent in per can be found by dividing 1,920,000,000 cm by 250,000,000 years.
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Explanation:

Step1: Recall speed formula

Speed is distance per time.

Step2: Identify units

We are dividing distance in cm by time in years. So the units of speed will be centimeters per year.

Answer:

centimeters; year