Answer:
Option (C)
Explanation:
The outer core of the earth is liquid in nature, where they are comprised of dense molten rocks, which flows continuously due to the heat energy radiated from the extreme core of the earth, having a very high temperature. This flow of liquid rocks across the present magnetic field lines of force generates an electric current which subsequently produces the magnetic field. This process of producing magnetic fields is commonly termed as advection.
Thus, the correct answer is option (C).
When two substances that have different temperatures touch each other,heat moves from one to the other by "convection" in which heat leaves its source and brings energy with it.
A. Thucydides
Thucydides was an Athenian historian and general.
Physical, such as mountains rivers lakes, etc. and/ or political maps of reigons are divided by boundaries.
