1. Steel
... were dark and cramped. The reason the towers were so dark was because having too many windows would weaken the structure. Soon Gothic cathedrals joined the quest for height. Long, stone arms, called flying buttresses, supported the cathedral's heavy weight, allowing the walls to be filled with colorful glass windows. George A. Fuller was the first person to invent the sky scrapper ... ...
- Word Count: 234
- Approx Pages: 1
- Grade Level: High School