You can get it off of a chalk Cliff or in limemud. after you bang your mom
Someone can get a sample of sandstone at cliffs and quarries around the world.
To measure the density of chalk, you need a sample of chalk, a scale to weigh the sample, and a graduated cylinder or measuring cup for volume measurement. First, weigh the chalk to determine its mass, then submerge it in water to measure the volume displaced, which corresponds to the chalk's volume. Finally, calculate the density using the formula density = mass/volume.
red :)
could be someone who wants a free sample, could be food given to a beggar
could be someone who wants a free sample, could be food given to a beggar
If someone had a chalk mark on their clothes, they could go to a laundry facility or a dry cleaner for professional cleaning. Alternatively, they might try removing it at home using a damp cloth or sponge to gently blot the mark, followed by washing the garment according to its care instructions. If the chalk is still visible, applying a stain remover before laundering could help.
could be someone who wants a free sample, could be food given to a beggar
In math, a biased example could be when, someone asks only males to answer "do you like this product." its when the people chosen to answer the survey/sample is not random
the closest i could find was "Mr. James Pillans is regarded as the inventor of the chalkboard (or blackboard). He was the Headmaster of a high school in Edinburgh, Scotland." he was using a chalk like substance on the boards but no one invented it someone just started writeing with it....
No, probably not - unless someone has contaminated it.
In the first instance - contact your nearest museum. They will either evaluate the sample themselves - or refer you to someone else who can give you a definitive answer.
Rock gypsum is a sedimentary rock. These rocks can be transparent or opaque. Examples could be chalk and chalk boards.