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1. Which led to the discovery of the layers of the earth?
A. Drilling
B. geologic digging C. ultrasound D.echo sounding​


Sagot :

Which led to the discovery of the layers of the earth?

D.echo sounding.

Explanation

So scientists rely on seismic waves—shock waves generated by earthquakes and explosions that travel through Earth and across its surface—to reveal the structure of the interior of the planet. ...