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*

I think that it is the last option.

Explanation:

I cant give explanation right now cause im in school.

But make sure to like and rate pleaseee.

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )

the florida everglades

explanation: