How is limestone formed?

Question

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Answer 1

Metamorphosis of sedimentary chalk deposits.

Answer 2

Limestone is the fossilized remains of millions of ancient limes. There used to be loads of lime trees in the past, and all the fruit that fell off of them (the animals didn't eat limes much, because they taste nasty) got fossilized and over millions of years since got all compressed and turned into 'limestone'.

You don't want to know about coprolite

Answer 3

there are many types of limestone and these types differ depending on certain conditions they were formed. they can be formed either inorganically (precipitation of calcium carbonate) or by physical accumulation of bioclastics (such as pieces of shells, coral fragments etc)..

natural chalk is one example of limestone that was formed because of the accumulation of small organisms such as coccoliths.. coquina is limestone composed of shell fragments glued together by precipitated calcium carbonate (which came from the shells itself).. in some areas, we find big formations of old coral reefs that have been exposed due to the lowering of sea level or by tectonic upheavals and we also call them limestone..

some limestone form features such as stalactites and stalagmites along the ceilings and floors of caves respectively.. these were formed through precipitation when slightly acidic water reacts with limestone formations resulting to precipitation of carbon carbonates (main component of limestone stalagmites and stalactites)..

limestone formations are one of the most common features of the earth.. we find them almost everywhere... reason for this? because most of these limestone form under the sea/oceans which comprise the bulk of the earth's surface...