Bronze is not obtained from the Earth's crust. Bronze is a man made alloy of Copper and Tin.
the source is found underground, and then it is mined
The Earths crust is approximately 650 km deep.
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
mantle
The earth's crust is not stress
half of earths layer
continental crust
The earth's crust is generally solid.
crust
The crust is the thinnest part on the Earth.
the crust and the core
crust