Respuesta :
To get a sample material from the mantle, drilling will be done through the oceanic crust rather than through the continental crust because oceanic crust is thinner than continental crust. Continental crust is thicker than oceanic crust and it is composed of granite. Oceanic crust is easily drilled.
oceanic crust is younger than continental crust but it does not provide any advantage in drilling so it is not a reason.
oceanic crust is more dense than continetal crust but it also not provide any advantage in drilling so it is not a reason
Answer:
Option (3)
Explanation:
The oceanic crust has a thickness of about 7 to 10 km on average, which is much thinner than the continental crust. In order to obtain the rock sample from the mantle, drilling must be done through the rocks of oceanic crust. It is because the depth from the seafloor up to mantle will be much lesser than the depth from the surface of the continental crust to the mantle.
It will require a comparatively lesser amount of money for excavation, in comparison to the drilling done from the continental surface.
Thus, drilling is more favorable to obtain mantle rocks from the oceanic crust.
Hence, the correct answer is option (3).
