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).
The College of Natural Sciences is one of the largest colleges of science in the United States. We are home to 12 top-10 programs, 13,000 undergraduates and graduate students, and 700 faculty. We benefit from our location in the creative and smart city of Austin, Texas. Learn more Â».