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“This is another name for what we call ‘asphalt’ in the United States. It’s the very sticky component or petroleum. It occurs naturally. Most of it is used to construction and road-making, but it can be refined to form crude oil. The ‘oil sands’ of Alberta and North Dakota are naturally occuring…”
“Cement is the base aggregate. It’s limestone, silica, and some other things. It’s a very fine powder. Cement, when mixed with other things, makes concrete. You mix it with sand, rocks, and water. So, the sidewalk in front of your house is technically concrete , not cement. Cement is just one…”