Erosion and deposition occur side by side​

Explanation:

Ans: Flowing water picks up soil particles, and carries them along until the flow ebbs and the particles sink to the bottom. ... Anything that reduces the energy of the flow field can cause larger particles to drop below the critical Reynolds number and drop out of the fluid stream (deposition)

True because that the materials taken from the erosion process are later deposited elsewhere.

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]

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker