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Chalk can be used to write on any hard dark surface that is slightly abrasive (not polished smooth).
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoHard surfaces have the necessary friction to make a piece of chalk, moved along that surface, leave a visible trail behind.
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What is the hardness of chalk?
There are a couple of things that make chalk hard. The calcium in chalk is said to make chalk hard.
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.
Is chalk calcium bicarbonate?
Yes "blackboard chalk", it is formed from the microscopic pieces of calcite (coccoliths) from sea micro-organisms. Soem other compounds are sometimes called chalk- e.g. "tailors chalk a very hard chalk used to mark cloth is often made from compressed "talc" a silicate mineral.
Forms earth's hard surface?
rock
Is chalk a soft rock?
Yes, it's a sedimentary rock composed of calcium carbonate. Classroom chalk is not necessarily the same as chalk the rock, since it may include binders and pigments in addition to pure calcium carbonate.
Why is chalk good for writing on hard surfaces?
because it is soft,rough,white and is shown clearly when writing
A hard tablet used for writing with chalk?
slate
A hard tablet used for writing on with chalk is called?
Slate
Add one letter: a hard tablet used for writing on with chalk?
help me pls
What is the hardness of chalk?
There are a couple of things that make chalk hard. The calcium in chalk is said to make chalk hard.
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.
Is engineering hard if you are good at math but not at writing?
No it is not
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.
Is chalk a hard or a soft rock?
Chalk is a hard rock, with large lines of weakness so will erode by physical weathering and the sea.
1. the chalk is hard.2. wood is____than chalk.3.stonr is the_____among the all?
2.hard 3.harder
How to build a road with chalk?
that would be hard
Is the rock 'chalk' hard or smooth?
It can be both
