When was Earth’s magnetic field strength high and when was it lower

Over the last two centuries the dipole strength has been decreasing at a rate of about 6.3% per century. At this rate of decrease, the field would be negligible in about 1600 years. However, this strength is about average for the last 7 thousand years, and the current rate of change is not unusual.

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hope this . : d

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.