Boundaries between the Earth's layers Choose one: A. are noted by the changing metal content of each layer. B. are defined by abrupt changes in earthquake density. C. occur because of tides. D. are places where there is an abrupt change in the density of rock.

community or area create social relationships that typically differ greatly from the affiliations ultimate effects of travel experiences on the population in areas of origin, as well as in places of wage of only a dollar or two. motorcoach operators, museums, and restaurants fall into the broad category of public

explanation: