Smog and other forms of pollution from urban cities can create more carbon dioxide as well as global warming and, in turn, affect rural areas that rely on energy resources for their crops and farmland. also increases the concentration of carbon dioxide which scientists believe is increase atmospheric temperatures worldwide. a) plants b) deforestation c) crop rotation d) acid precipitation

b) to encourage free trade

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.

answer; ///attempts to change more than once behavior at the same time;

spain, portugal, france and england.

explanation:

spain, portugal, france and england were the first european country to carve an empire in the americas.

you gave no answer choices so, i gave you all of the correct countries.