Why doesn't the sea sink into the seafloor?

This week, the cause of vitiligo, whether pork is linked to a sore throat, what happens to a flame in microgravity, what causes albinism, what is dark matter and why can't we see it, why doesn't the sea sink into the seabed, why is window-cleaner fatal for flies, what determines diastolic blood pressure and why are some babies born prematurely? Dr Chris takes on more top questions from the listeners of Talk Radio 702... Like this podcast? Please help us by supporting the Naked Scientists