give two examples of limestone.and give two ways in which they are different.
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1)Chalk – The White Cliffs of Dover
The famous White Cliffs of Dover consist of chalk, a type of limestone. The skeletons of small algae called coccoliths, deposited over thousands of years, became the white mud chalk that made the cliffs. Even though you can't see these small skeletons without the help of a powerful microscope, upon careful examination of the cliffs you might find skeletons and fossilized remains of ammonites, sea urchins, shells and sponges. This type of chalk isn't the same used for blackboards in schools, which typically comes from gypsum.
2)Coral Reef Limestone
Coral reefs provide examples of limestone made from the skeletons of coral invertebrate – animals that do not have backbones – in the ocean and even on dry land. The Guadalupe Mountains National Park in New Mexico offers an example of one of the most well-preserved limestone fossilized coral reefs in the world, aptly named the Captain's Reef. Wind and weather erosion exposed this ancient limestone coral reef, made millions of years ago along the margin of the Delaware Sea, which existed in what is now New Mexico. Tectonic uplifts along the fault – after all the water evaporated – thrust the reef upward while creating the Guadalupe Mountains.
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Examples of limestone are chalk and coral reef limestone.
The chalk. The famous white cliffs of Dover consists of a chalk it's a type of limestone. Coral reef limestone is consists of skeletons invertebrates animals