Why are there so many rules when visiting antarctica

What does the exposition in the beginning of act one tell readers about the way they are to perceive the events that follow? explain?

What would happen to the tides if there was no moon and no sun in the sky?

What policy did "jim crow" laws put in place? black codes integration segregation 2. the supreme court case that established the doctrine of "separate but equal" was dred scott v. sandford plessy v. ferguson brown v. board of education 3. the supreme court case that overturned the doctrine of "separate but equal" wasdred scott v. sandford plessy v. ferguson brown v. board of education