Answer:
Option: (D) To identify patterns of diffusion and their effect on the host country.
Explanation:
The geographer purpose of studying the pattern of migration is to look at the reasons for the people leaving their native country and migrating to the host country.
To check the migrant's effects on the host country, it would be useful to divide two groups according to their skills - highly educated and skilled labor. Migration would affect the country because they will help the host country to built-in a good shape by their skills and knowledge.
The empire was divided into many provinces and each one of these provinces was governed by a governor and council of ministers. In the provinces there were local officials called rajukas, who became more powerful during the reign of Ashoka.
Answer:
animal wastes and fertilizers
Explanation:
The majority of the nitrates that are polluting the rivers come from the animal wastes and from the fertilizers used in the agriculture. The increased amounts of nitrates in the rivers causes eutrophication. This basically means that the water is becoming over-saturated with nutrients. This leads to the spreading out of the algae. As the algae spread out more and more, they cover the surface part of the water, so large portions of the rivers do not receive sunlight, which kills of the organisms that use photosynthesis. Further, the algae reduce the amount of oxygen in the water, often resulting in dying out of the fishes. It is a chain reaction that leads from one thing to another and the end result is devastating.
