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).
50 Largest Universities in the United States. If you're interested in attending a booming metrpolis of students in some of the nations largest colleges then you've come to the right place. A big advantage of attending a large school or university is the fact that many of them are very accredited and well respected institutions. Most of these schools have national sports teams, convenient on-campus restaurants, and wonderful recreational facilities.