Question

the earths magnetic field varies in
a) varies in direction but not in magnitude
b) varies in magnitude but not in direction
c) varies in both magnitude and direction
d) constant in both magnitude and direction
(no useless answers)​

Answer 1

Answer:

The field strength is determined by the magnetic field lines passing through that place which are different at different positions. So, it varies in both direction and magnitude. The earth is rotating about its axis which passes through the Atlantic and Antarctica