Siying's mother and father both lacked any formal education and supported their family by working as shoe shiners in a New York City subway station. Siying got a scholarship to attend an Ivy League university, went to medical school, and is now a neurosurgeon at a hospital in Boston. This is an example of:

vertical social mobility.

Explanation:

Vertical social mobility is a situation when a person move either up or down within a social hierarchy.

In most societies, vertical social mobility is heavily influenced by 2 factors: ownership of Resources and influence. Having more of either of these factors will make a person move up within the social hierarchy, and vice versa.

In the example above, Siting move from the daughter of a shoe shiners into a Neurosurgeon. Her job as a neurosurgeon most likely provided with more salary and influence compared to her shoe shiners parents. This means that she experience an upward move within the social hierarchy.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.

the answer is       political office  

hope this .