Question

 Why do we use chalk on blackboards?

Answer In 1809, Philadelphia introduced the first blackboards, used with chalk, to public schools. Similar group teaching tools are still in use today and remain an instrumental, inexpensive teaching reso... Read More »
http://www.answerbag.com/q_view/1959724

Top Q&A For: Why do we use chalk on blackboards

Are chalk and dust cravings normal while pregnant and is it safe to eat chalk?

Cravings for non-food things (chalk, dirt, tin foil, that sort of thing) is called Pica. It can occur from a nutritional deficiency, and for other reasons.You should contact your doctor or midwife ... Read More »
http://wiki.answers.com/Q/Are_chalk_and_dust_cravings_normal_while_pregnant_and_is_it_s...

What Are Blackboards?

The smell of chalk dust is a common childhood memory; the punishment of clapping erasers was one of the most dreaded in the classroom. For many adults, blackboards are an integral part of our educa... Read More »
http://www.ehow.com/info_8264595_blackboards.html

How do I clean blackboards?

Daily CleaningClean the chalk out of a standard blackboard eraser by vacuuming it, rubbing it on a clean cloth or banging two erasers together outdoors. Erase the the blackboard using the clean bla... Read More »
http://www.answerbag.com/q_view/2105980

What Are Blackboards Made Of?

Blackboards, or chalkboards, are made of slate tablets that allow teachers to use chalk to write temporary phrases and lessons on the slate, which can be erased later easily. The slate can be cut t... Read More »
http://www.answerbag.com/q_view/2416816


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