Cement, or Portland cement, is a dry powder made. from limestone and other materials. It is burned in a. kiln and then finely ground. Cement reacts chemically. with water to cause concrete to harden.
There are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.here are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.
There are 43,560 square feet in one acre.   An acre is a unit of area. 640 acres equal a square mile. Hence, it is 1/640 of a square mile. Since a square mile contains 2 â¦ 7,878,400 square feet, an acre is 27,878,400 divided by 640, which is 43,560 square feet.