sprinkle water on it
: higH
the limestone harden because theirs another layers of limestone on top of it which pushes the bottom layer and flatten it.
Limestone
Not sure what you mean but A) limestone IS natural anyway, and B) some limestones are relatively soft while in the middle of their unit but harden once quarried and exposed to the air.
cement is a calcined mixture of limestone,silica and gypsum that are anhydrated and form a hard structural bond on drying
Mortar has fine rock called, "Sand" in it. There is also finely pulverized limestone in it that helps harden it.
sedimentary rock -sedimentary rock because organisms die on land or on the bottom of a body of water and the sediments cover it and harden to form fossils. -also, limestone can form fossils.
mikro screening
Yes, harden is a verb.
No. The word "harden" is a verb.
The present tense of "harden" is "harden." For example, "The clay hardens as it dries."
"Harden" is the present tense. Ex. I harden the the cement by allowing it to dry. The past tense is hardened. The future tense is will harden.
it will harden in a hot temperature