How limestone formed.

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How limestone formed?

Most limestones in our part of the world formed in

shallow seas that covered our area hundreds of

millions of years ago.  


Other names for limestone

We use the scientific name "limestone" for this rock,

but it is also known by many other names:

 When limestone is crushed into gravel and

used for building roads or making concrete, it's often called an aggregate.



Here are some ways to classify limestone (by grouping it with similar types of rocks):

   Geologists have a catch-all term that includes both limestone and dolostone.  They call them carbonate rocks.


 Limestone is a sedimentary rock.

How to recognize limestone

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Acid Test

This simple test helps you tell rocks that are

made of calcite from similar rocks made of other


All you need is some white vinegar.  (If your

parents or teacher can get it, some weak

hydrochloric acid will give you more dramatic


Put a large drop of vinegar (or a small drop of acid)

on your rock and watch what happens for a minute

or so.

 If the rock is made of calcite, small bubbles will start to form inside the drop of vinegar.   ...

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