Socially or economically disadvantaged research subjects are

Socially or economically disadvantage research subjects are weak populations. Vulnerable inhabitants consist of economically deprived, cultural and cultural units, the uninsured, low earnings children, the elderly, the dispossessed, those with human immunodeficiency virus, and those with additional chronic health conditions, as well as severe mental illness, it may also comprise rural residents who frequently come across obstructions to get into healthcare service. The susceptibility of these individuals is better by race, ethnicity, age, sex and factors such as income, insurance coverage and absence of a usual source of care. Their health and healthcare problems meet with social factors as well as housing, poverty and insufficient education. 

which of the following is a subsurface event that takes place during the rock cycle?

  cementing  erosion  melting  weathering