Is it possible for the oceans to freeze solid (at least on the surface)?

Can the oceans freeze (at least several feet below sea level)? I know that the temperature for salt water to freeze is lower/colder than fresh water, and when it does freeze, the ice is mostly salt-free, but I'm wondering if it's possible for the entire surface of the ocean to freeze over. Yes, I know about the land-bridge during our last ice age which allowed humans to cross from Asia into North America. So it is at least partly possible, but I'm wondering about ocean wide.

Also, if this is possible, what kinds of impacts would that have on the entire Earth's ecosystem? For instance, would all rivers/streams freeze over at this point?

Additionally, if the oceans could freeze, would that affect tectonic plate movement at all?

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Is it possible for the oceans to freeze solid (at least on the surface)?

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