Concrete is a mixture of cement, water, sand, gravel, crushed rock, or other aggregates. Sometimes, one or more admixtures are added to change certain characteristics of the concrete, such as workability, durability, and time of hardening.
Top 100 Colleges by Highest Tuition. Here are the top 100 most expensive colleges by tuition for the 2008-2009 school year. The latest numbers can be found in our most expensive colleges ranking. Notes: Some colleges like Bates College, Colby College, Middlebury College, and Union College have a comprehensive fee (tuition + room/board).
Answer Wiki. 8 Answers. , Professor, Dean, Associate Provost, ACE Fellow, Physicist. To the other answers I'd just add that in some fields (e.g., the fine and performing arts) the highest degree is Master's degree (MFA). So someone who is a full Professor in those fields would not have (or need) a doctorate.