Which of these is the best example of erosion? A Wind carries sand from one side of a beach to the other. B A flowing river wears down the edges of rocks so they feel smooth. C An earthquake causes a fault line to appear in the ground. D Ocean waves cause rocks to break down into sand.​

D

Explanation:

B

Explanation:

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

answer ( groundwater);