Scientists can only see the earth surface, can only theorize what is under it

[Bignose]

Nit picking

sure, but you're the one who started with 'to be fair' and didn't qualify your use of the absolute 'only'. Because we can obviously do more than 'only theorize.'

[Strange]

To be fair, we can only theorise about what it is we see in the data.

 

That is all science ever does.