Answer:
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.
Answer: C,A,B,D
Explanation:
The solar system consists of the sun, the planets and other bodies orbiting it. The formation of the solar system occured in the following order:
C. Hydrogen and helium formed atoms.
A. Earth was bombarded by new materials after formation.
B. Earth separated into layers based on the weight of materials.
D. Outgassing of volcanoes produced a primitive ocean
Therefore, the correct option is C, A, B, D.