In the Crystal Palace, Joseph Paxton made use of barrel ...

[bobthebuilder]

In the Crystal Palace, Joseph Paxton made use of
 
  barrel vaults.
   a balloon frame.
   a steel frame.
   cast iron.

Question 2

Chris Olfili's Holy Virgin Mary and Michelangelo's Last Judgment
 
  both resist interpretation according to formal theories.
   are both universally regarded as masterpieces.
   were both subject to censorship.
   are similarly unable to be interpreted using contextual theories.

[tanna.moeller]

Answer to Question 1

cast iron.

Answer to Question 2

were both subject to censorship.

[bobthebuilder]

Thank you!

[tanna.moeller]

Happy to help