Which concept describes early earth as separated into layers by gravity, with each deeper layer denser than the layer above?

a. centrifugal force
b. density stratification
c. seismic theory
d. tectonic theory
e. continental drift

Density Stratification

Explanation:

Density stratification is a result of gravitational forces and results in the layering of materials as a function of density. The denser (heavier) material is found beneath the lower density (lighter) material.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

the answer is the last option or letter d)