A layer cake profile of different soil types is exposed when we dig into the earth. Geologists reason that these layers were laid down sequentially and that layers lower down have to be older than the layers above them. This is called the law of
CorrectA. superposition

The layer cake profile of different soil types having older soil type at the bottom of the layer is proved by the law of superposition.

Explanation:

The literal meaning of the word superposition means arranging one over the other. So the first generation soil or rocks will be deposited first on the mantle followed by the coming generation of soils and rocks. Due to different kinds of disasters like tides, earthquake, soil erosion etc., the new soil or rocks coming from any other region will get deposited on the surface of the old soil layer just like a layer cake format.

So the presence of older soil in the bottom most part of the mantle and the youngest soil or rock in the topmost surface of Earth is proved by the law of superposition.

hypothesising or postulating