White boards are more environmentally friendly because chalk leads to airborn dust being breathed into the lungs. It also eliminates the need for the manufacturing and shipping of chalk.
It can be because some sidewalk chalk contains lead.
A major component of sidewalk chalk is calcium carbonate, CaCO3
i do not believe there is any possible way to preserve sidewalk chalk.
Sharon McKay invented sidewalk chalk, after she wrote books that included it.
How are they not environmentally friendly
colored chalk sidewalk chalk dustless chalk
No mining operation is environmentally friendly.
ya i think so... type in "how to chalk your hair with sidewalk chalk" and the first website to pop up will probably be "the mane dish"... click that and TA DA
YEP!
Yes, wind power is environmentally friendly.
it is not environmentally friendly thirs nothing friendly about tesco thy lie