Every so often coastline naturally erodes and land falls into the ocean. How do we still have land?
In: Planetary Science
Land is also constantly being pushed UP from under the ocean. Volcanic actively will spew out lava that then solidifies into a new piece of land. And tectonic activity will have two or more plates smash into each other and push some land up.
Interestingly enough you are definitely on to something. “older” land tends to be less mountainous and closer to see level precisely because of erosion.
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