Describe about natural sources & manmade sources in environment pollution.

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

Which of the following is not a place where hydrogen can be found on earth? a. natural gas well b. atmosphere c. water d. mine

Residents of moldova are mainly a. russian b. ukrainian c. serbian d. romanian the answer is d. romanian