I'll offer some possibilities: The uniformity of gravity wherever you are on earth's surface; the agreement of observed times of sunrise and sunset, and other astronomical observations, with those predicted by our current models. There is also the data gathered and used for the mind-bogglingly accurate performance of GPS systems. If earth were not (very close to) spherical, this data would reveal it.
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why do pieces of earths earliest crust not exist today
theory of plate tectonics
A volcano is the opening called in the earths crust called through which lava gases and other pieces of rock erupt.
Lithospheric plates.
Tectonic Plates
8.35cm
Lithospheric plates are a number of rigid but moving pieces of earths surface.
Takoyaki
The crust.
Pieces of the lithosphere
Meteoritesis what we call stones that enter the earths atmosphere.
8
Normal puzzles have different levels of difficulty depending on age. They lie flat. Spherical puzzles are for older children and adults. They are not flat. The pieces come together and form a spherical shape.
why do pieces of earths earliest crust not exist today
Micrometeors
Corroborating it with other pieces of evidence
Meteoritesis what we call stones that enter the earths atmosphere.