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Why can you use chalk to write on the blackboard but not granite?
Wiki User
∙ 6y ago
Chalk is softer than the slate (real or artificial) used on blackboards, so it will flake off as you write. Granite is harder than slate and will not flake, but rather cut into or mark the slate permanently.
Wiki User
∙ 6y ago
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Is the chalk you find in nature the same as the chalk that you use on the board?
Nature's chalk is limestone--hard. Blackboard chalk is soft--gypsum.
What rock do you use to write on a chalkboard?
Chalk
The porosity of granite?
As much as 1% in granites sold for interior use. That is "granite" not granite though.
Describe granite using the three characteristics geologists use to classify igneous rocks?
Granite is a felsic, coarse grained, intrusive igneous rock.
Why don't we use an average granite as a source for useful metal?
1. Granite is a course-grained intrusive silicic igneous rock, it is a nonmetallic resource. Therefore they are not malleable nor a conductor. Even though granite contains metal ions, the minerals in granite contain relatively little metal, so it would cost more to separate the metal from the granite.
Is the chalk you find in nature the same as the chalk that you use on the board?
Nature's chalk is limestone--hard. Blackboard chalk is soft--gypsum.
Why won't chalk write on your new blackboard does it need conditoning before use?
The problem likely lies with the chalk itself. A lot of chalk you buy today, especially cheap chalk, is too hard to use on chalkboards with any kind of good result. Try a different brand of chalk, one that is softer.
What can use for a making a chalk?
If you mean blackboard chalk, it is generally made of the mineral gypsum, which is calcium sulfate.
How is the term blackboards properly defined?
A blackboard is a piece of slate stone on which people can write multiple times and erase what they wrote. One can use chalk to write on the surface and then remove it easily even with bare hands.
What is the best way to mix blackboard paint?
The best colour pigment to use with a traditional blackboard is natural chalk. You can buy chalk-sticks to draw on a blackboard in a well-assorted stationery store or from companies specialising in educational equipment. The huge advantage of chalk over any mixed paint or other pigments is the easy removal and non-toxic quality of the material which is thus safe to use for all age groups.
Why is chalk important?
because we can use it to write on chalk boards
How we decorate a baby creche?
Use bright colours on the walls and furniture. Have one wall as a very large blackboard for the children to chalk on.
What rock do you use to write on a chalkboard?
Chalk
How do you season a new chalkboard?
Blackboard manufacturers often advise that a new or newly resurfaced chalkboard be completely covered using the side of a stick of chalk and then that chalk brushed off as normal to prepare it for use. Blackboards are commonly used in teaching. The chalk marks can be quickly and easily wiped off with a damp cloth or a special blackboard eraser consisting of a block of wood covered by a felt pad. Chalkmarks made on some types of wet blackboard can be difficult to remove.
How to you clean a blackboard?
Use a wet towel or sponge. put a few drops of detergent in the water. After the (slate0 board is dry, chalk it by rubbing the side of a stick of chalk all over it then erase it with a felt eraser.
What is the difference between tailor's chalk and a chalk pencil?
TAILORS; when tailors make your clothes,they use that chalk.(it might be erasable) PENCIL; you use it to write your assignments on the paper.
What you use to write on the board is called?
it is called a marker, or you can also use chalk
