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).
4. Yale University. Yale comes in at the #4 best college overall as well as the #4 music school. With a student to teacher ratio of 6:1, students can expect to enjoy small classes created through an arranged partnership with the schoolâs undergraduate major and the graduate professional program.