Why Is Gravity Infinite at a Black Hole's Center but Zero at Earth's Center?

Sasikanth9
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Gravity is zero at the center of the earth. how come the same set of equations predict the gravity to be infinity at the center of a black hole? where does the singularity really come into picture? how is a black holes center different from Earth's center?
 
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Should have done more research before posting . Anyways somebody else might find this useful.
 

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