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Well...

Jkirk3279 24th Nov 2009

You have to consider, that a microscopic black hole could only
take in microscopic particles.

It's volume will increase as the cube of it's mass.

So for a very long time, it will nibble on electrons, and its' mass
will creep up.

Until one day, it gulps down a Proton.

Soon it will be swallowing whole hydrogen atoms, and by the
time it gets to 1/64ths of an inch in diameter it will be scooping
up magma at a huge rate.

While the mass of the Earth will remain unchanged, as the matter
in the center of the Earth is swallowed vulcanism will shut down.

Shortly thereafter the Earth's magnetic field will collapse, and we'll
be bombarded by solar radiation.

IF there's enough friction to slow it down, the black hole's orbit
will stabilize at the center of the Earth, and once it's consumed
the magma it will stop growing.

The question is, will the remaining shell of rocky crust be able to
support the weight of the oceans without having the support of
the magma.

I suspect... not. So the oceans will flood into the Core, and the
resulting steam explosion will destroy all life on Earth.

The good news is, the last stages should only take a day or so.