Question

U
SCII
SUITicient country.
3) Pollution is the minor problem in cities.
4) Tourism within the limits of country is called​

Answer 1

3] Air contamination killed approximately 7 million people in 2012. Urban air contamination is a serious problem in many of the planet's big cities. Intense and unremitting traffic, together with uncontrolled factory emissions, convert city air worldwide into authentic clouds of smog.

4] Tourism within the limits of a country: When a person travels within the parts of a country is called domestic tourism. ... Tourism outside the country boundaries: When a person travels from his own country to abroad or alien land is called International tourism.

Hope it helps~