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it is used for concrete because it dry into a hard substance and when mixed with the right substances, can dry under water
ionic
by have hard sex
sand because when u see in microscope its a little hard shells
The most common constituents that make water hard are magnesium and calcium ions, since these form only very slightly soluble salts with anions in soap. The other alkaline earth metal cations have the same effect, but occur less commonly.
it is used for concrete because it dry into a hard substance and when mixed with the right substances, can dry under water
This wasn't very hard, the answer is :CHEMISTRY!
mineral substance
you boil it in boiling water
The water was evaporated.
Ice block
it becomes soft
If you freeze water(liquid) it becomes ice(hard) its a liquid in a solid form
salt
ionic
this is because it is a hard substance
when wate ris adde to metallic oxide it forms a hard substance