The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature. Whatever really happened, Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest.
U have to list the factors so i can answer the question
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.