Directions: Please use four to six sentences to answer the focus question below.
Focus Question: How and why has Civilization changed over time? (Make sure that you
use specific examples from the chart above to prove how and why civilization has
changed over time.)

1history is previous events that have occurred in the past

The following passage describes an example of __negative externality in the 1980s, manufacturing power plants in the midwest burned coal with high sulfur content, which when released as smoke, mixed with moisture in the atmosphere to create an acid that blew into canada and new england. the acid fell to the earth in the form of rain, killing fish and causing deforestation and building deterioration.