Explain this statement- "Internal changes within the air, water, soil and sound around us is called pollution".

This is an explanation of pollution. I hope this helps because I’m not sure how specific you need the answer or what you need it to be either.

there is an explationation of this on a site called crash   course world history 1

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.