Which one of the following is an important fundamental assumption underlying the plate tectonic theory?
A) Earth's magnetic field originates in the outer core.
B) Earth's diameter has been essentially constant over time.
C) Radioactive decay slows down at the extreme pressures of the inner core.
D) Earth's ocean basins are very old and stable features.

Question

Quizplus · Accepted Answer

The plate tectonic theory assumes that Earth's diameter has been essentially constant over time, which is necessary for the concept of moving tectonic plates. If Earth's diameter was changing, it would affect the size and shape of the plates and the movement patterns. The other options (A, C, and D) are not directly related to plate tectonics.

Which One of the Following Is an Important Fundamental Assumption