barry is applying the principles of relative dating to a building that has been constructed. analyzing a section of the building, barry

says that the lowest part of the section must have been constructed

the parts above it were constructed. he

bases this conclusion on the principle of

. also, looking at a crack forming in the building wall, he says

that the crack must be

the wall. barry used the principle of

to arrive at this

conclusion.

reset

next

2010

11