One reason it was a health threat is it caused teeth to become ground down which would then lead to infections. The same was true with their eyes and lungs, sand would be blown into their eyes or inhaled into their lungs and then could cause infections.
Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons.
Answer: classical conditioning
Explanation: Phobia are acquired through classical conditioning and maintained via operant conditioning, Carlos acquired the phobia because of his encounter with the bear thus, classical conditioning way of acquiring phobia. The operant conditioning of the Carlos's phobia is due to the fact that he still avoids bears i.e he keeps or maintained his phobia.
A conditioned response (if you are learning about Pavlov's theory)
