Production of iron during this period also rose rapidly.  This fed the construction boom.  The chief reason for this explosion was

Which of the following materials are commonly found major in Medieval buildings? 

The Sophia Hagai “seems to float on air” mainly due to what innovation?

Most castle walls were insulated with _________________________________________.

The _________________________________ method of determining the size of the footprint of a building estimated the footprint size of the Cathedral in Bern, Switzerland (left) to within 60 mm before it was built. 

Most cathedral failures came from _____________________________.

On which massive ancient structure were the workers instructed to finish the stone at the quarry, and transport it in, so that no hammer or chisel or any iron tool was heard in the temple while it was being built; and that the stone blocks had to fit together perfectly, as no mortar or clamps would be used to hold the stones in place?

Of these, which is the Masterbuilder that had the greatest influence on the construction of the Duomo?

The key ingredient in medieval mortar was ___________________________.

DNA stands for ___________.