The difficulty in finding limestone depends on the type of rock formations that exist in the area searched. However, limestone is a very common rock, found almost anywhere on the planet.
Nature's chalk is limestone--hard. Blackboard chalk is soft--gypsum.
Limestone.
Chert.
dolostone. dolostone.
chert
hard
not easily transpoprtable and hard to find/get
You can find limestone anywhere under the ground.
It is a limestone, hard.
limestone
limestone
Hard and soft are relative attributes. Compared to a Marshmallow, limestone is very hard. It's even harder when comparing it with candy floss. In comparison to granite, steel or diamonds, limestone is a pretty soft rock.
the hardness of it is 3 - 4
Nature's chalk is limestone--hard. Blackboard chalk is soft--gypsum.
you associate limestone rock with hard water.
Limestone Perth, Western Australia
the constituents of hard glass is potassium carbonate , limestone and silica