The answer is Pennsylvanian. I worked on this before. The Pennsylvanian era is a subperiod of the Carboniferous Period. i really hope this helps :)
Scientists attribute soil formation to the following factors: Parent material, climate, biota (organisms), topography and time. ... The physical, chemical and biological properties of the different soils can have a big effect on how to best manage them.
Oldest to youngest- D, A, E, B, C
It's called relative dating, you basically find the rocks that are at the very bottom (oldest), look for the ones that are on the top (younger), but if you find any that are cross cutting, those are the youngest of them all.
A. The formation of new democracies after the fall of the Soviet Union
Theodosius the Great, was Roman emperor from 379 to 395. He is best known for making Christianity the state religion of the Roman Empire and great architecture projects in Constantinople.