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Comment by 1970-01-01

7 hours ago

We almost certainly did at one point, but life and tides can fill-in the gaps. We also truly do not know what terrain is underneath Antarctica, Greenland, etc.

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1970-01-01

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ceejayoz 6 hours ago

What? Yes, we do.

https://science.nasa.gov/earth/earth-observatory/uncovering-...

https://sealevel.nasa.gov/resources/75/the-bedrock-beneath-a...

https://commons.wikimedia.org/wiki/File:AA_bedrock_bedmap2.4...