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concrete and cement
Pam Nelson at Triangle Grammar Guide answers a question I never even thought about. What is the difference between concrete and cement:
Cement is the dry powder that is mixed with other things (water, sand, gravel) to make concrete, which is the hardened stuff used for sidewalks and some roads. Cement is only cement as long as it's dry. Another way to think of it is that cement is to concrete as flour is to bread.
She got this information from
Wisegeek, which is a great resource for anyone who is curious.
