Earth is about 29 percent land and 71 percent oceans.
Plate tectonics and related factors are at the root of the issue. Plate tectonics is the movement of the continental plates on the surface of the Earth as they ride along on top of the mantle.
With that ratio staying consistent, other factors remain consistent, too. And if those factors encourage the biosphere, that's good for habitability. One of those things is nutrients. Radioactive decay of elements like uranium in the mantle creates heat that's trapped by the continents' blanket effect.
Then there's the water content in the mantle. More water in the mantle lowers the mantle's viscosity, defined as resistance to flow. Mantle water content is part of a feedback loop with mantle temperature. As more water enters the mantle, it flows more easily. That increases convection, which releases more heat from the mantle.All of these factors and others combine on Earth to create robust habitability.
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