Question

multiple choice question
which of the following is the best approximation of the average speed of earths tectonic plates?
1 cm/yr
1 m/yr
1 km/yr
1 mm/yr

Explanation:

Earth's tectonic plates move very slowly. On average, they move a few centimeters per year. 1 cm/yr is a reasonable approximation among the given options as they are all in a per - year unit and 1 cm is a typical order - of - magnitude for tectonic plate movement speed.

Answer:

1 cm/yr (assuming this is one of the options you intended to list fully; if not, based on the information given, the closest reasonable one from the options presented would be the one representing 1 centimeter per year)