What would happen if Earth had oceans of dense gas instead of water?

Ignoring the fact that we need water in order to survive, what would happen if all of the "oceans" on Earth were filled with a dense non-reactive gas (e.g. xenon or sulfur hexafluoride) instead of water.

Specifically, would the gas stay in the ocean basins, or would it mix with the the rest of the atmosphere? Additionally, how would this affect the weather patterns on Earth?

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What would happen if Earth had oceans of dense gas instead of water?

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