Answer: The earth is made up of three different layers: the crust, the mantle and the core. This is the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly composed of basalt.
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Cement
Cement is made by heating powdered limestone with clay. Cement is an ingredient in mortar and concrete.
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The answer is A. For the record, It's been a couple years since I took bio, but a quick google search did a refresher for me. If you're looking for an answer quickly it might be a better idea to just search it that way, I love this site, don't get me wrong, it can just be slow.
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This is because it is not based on scientific evidences,but rather on hypothesis from unverified information and ear says.
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The branch of Zoology which is called pseudoscience because of lack of concrete evidences is called Crytpozoology.
it was designed for the study of set of animals in which scientific evidences for the existence is lacking.However,hypothesis based on oral stories,unreliable description by purported eye witness. non factual physical evidences and ear says are used to judge the existence.
Blancou in 1959 first coined the word.But the actual mention in scientific field was in 1965 by Bernard Heuvelmans .
Bigfots ,Chupacabra are examples of animals that cryptozoology has been used to give account of.