Looking at the image below, which of the four spheres of Earth is labeled Sphere 4?
4 Spheres of Earth
Sphere 1
Sphere 2
Sphere 3
Sphere 4

This is what i found “getting into the technicalities, the continental crust has a density of around 3.0 g/cm3 compared to 2.6 g/cm3 of the continental crust. in addition, the continental crust is much thicker than the oceanic crust. the recycling process does not happen to the continental layer.” i hope this you for what your looking for. can you plz mark me brainliest?

Its decreasing because of illnesses

The correct answer is:   [b]:   "physical systems" .