In what ways did the Romans use concrete in their construction ...

[notis]

In what ways did the Romans use concrete in their construction methods?
 
   Formwork using wooden temporary supports to pour
  arches
   Coffered ceilings to create domed structures
   Poured concrete to create the channels of the
  Aqueducts
   All of the above

Question 2

The Crystal Palace was considered an engineering marvel for its time because:
 
   It was prefabricated
   It used large sizes of plate glass
   It had a skeletal frame of iron
   All of the above

[Dunkey]

Answer to Question 1

all of the above

Answer to Question 2

all of the above

[notis]

Thanks for the timely response, appreciate it

[TheNamesImani]

Great answer, keep it coming