There is no law saying you have to pay them much and they will work for any wage
Layer B would 'be'(get it??) would be the oldest of the two because it came before layer D. The second part to the question I don't understand.
It would lead to a economic decline
6. Hard engineering manages costal zones in order to protect high value areas from flooding or falling into the sea through erosion example: a sea wall which will be strong to protect
7. C is stack and I can’t really see B and A
Erosion i believe is the answer