Stone+exercise

2statements of comparison and contrast:
====-"Its advantages are durability, adaptability to sculptural treatment, and the fact that it can be used in modest stuctures in its natural state. But it is difficult to quarry, transport, and cut, and its weakness is tension limits its use for beams, lintels, and floor support." ==== ====- "...stone masonry (in contrast with brick) does not depend on strong bonding for stability where it supports only direct downward loads." ====

2 statements expressing cause and effect:
====- "Because of its weight and precision with wich it can be shaped, stone masonry (in contrast with brick) does not depend on strong bonding for stability where it supports only direct downward loads." ==== ====-"...But this roofing requires so many columns that unvaulted masonry buildings are almost always combined with floors and covering in wood." ====