Rocks are used all around us in many different ways. In the classroom, students use rocks everyday. Graphite, a metamorphic rock, is the part of the pencil used for writing.Slate, another metamorphic rock, was used to make blackboards in years past.Now most blackboards are constructed of man-made materials. Chalk is a soft form of limestone which is a sedimentary rock.ocks are used all around us in many different ways. In the classroom, students use rocks everyday. Graphite, a metamorphic rock, is the part of the pencil used for writing.
1 The pavers that they sell are priced anywhere from $3 to $6 per square foot. 2  According to the website PaverSearch.com, the price of pavers can range anywhere from $0.50 to as much as $15 per square foot. 3  The cost is going to greatly depend on the type of paver. Concrete pavers will cost anywhere from $5 to $12 per square feet. 2  Something such as natural stones are going to have to be customized most of the time, meaning a higher price tag. 3  Poured concrete pavers give the illusion of pavers and can cost anywhere from $3 to $7 per square meter.
Average maximum cost of interlocking driveway pavers for 300 square feet: $2,160. Costs for interlocking driveway pavers can fall into several categories. The first category is the price to purchase the pavers and the other necessary materials. The pavers are sold by numerous manufacturers at various quality levels. An average paver costs from $1.23 to $1.50/sf. The substrate for a 1,000-square-foot driveway would cost more than $500, and the concrete would cost around $75. Joint sand would cost under $50. The second category is cost of installation.