If the continents were eroded completely into the oceans there would be no continents and no land left. … Without plate tectonics that push the continents up the erosion would result in the continents disappearing under the surface of the oceans.
Why do we need plate tectonics?
Without plate tectonics our planet would be a very different place. The constant recycling of the Earth’s crust provides us with a stable climate, mineral and oil deposits and oceans with a life-sustaining balance of chemicals. … Earth is the only planet we know of that has plate tectonics.
