GEOLOGY

Detailed explanation-1: -The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.

Detailed explanation-2: -Within a geological column, rock layers are organized from the oldest to the newest, with the oldest rocks being closer to the Earth’s core while the newest rocks being closer to the Earth’s surface. Concerning such layering, geologists and anthropologists can determine the periods from which fossils derive.

Detailed explanation-3: -The oldest rock layers are at the bottom because they were laid down first. The landscape changed across the eons, adding more layers on top of older ones. The youngest rock layers are on top of the rest.

Detailed explanation-4: -The oldest rocks are at the bottom of the column. Rock layers in a geologic column are distinguished by the types of rock the layers are made of and by the kinds of fossils the layers contain. Fossils in the upper, more-recent layers resemble modern plants and animals.

Detailed explanation-5: -Over time, the sediments pile up to form horizontal layers of sedimentary rocks. The bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all.