Which of the following statements is true?

Air pollution has been around since the beginning of the world (for the most part).

The world’s air quality was worse in the 1200’s than it is today

The London fog (aka Great Smog) pabed the way for the Clean Air Act of 1970

The pollution event of Donora, PA was a minor occurrence that attracted only local media attention

*pretty sure it is not the first or second one*

Why is terracing used in southeast asian agriculture?

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.