Answer
Increase.
Work Step by Step
The mass of the Earth was increased and the radius of the Earth was increased slightly. Since $I=mr^2$ and both the mass and radius were increased, the moment of inertia of the earth must have increased.
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 10 - Rotational Kinematics and Energy - Problems and Conceptual Exercises - Page 328: 79
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