Calcarious material includes_________________?
Correct answer: D. all of the above
- A. lime stone
- B. marble
- C. chalk
- D. all of the above
Explanation
Calcareous materials are rich in calcium carbonate, CaCO3. Limestone, marble and chalk all contain mainly calcium carbonate, although their textures and geological origins differ. A student may select limestone alone because it is the most commonly used source, but marble and chalk are also calcareous.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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