select the best evidence to support the statement here has been a large increase in the number of earthquakes since the 1970s.\ there may be more than one correct choice. within the central and eastern united states, the number of earthquakes has changed dramatically over the past few years. between the years 1973–2008, there was an average of twenty - one earthquakes of magnitude three and larger in the central and eastern united states. this rate jumped to an average of ninety - nine magnitude three or larger earthquakes per year in 2009–2013, and the rate continues to rise. in 2014, alone, there were 659 magnitude three and larger earthquakes. most of these earthquakes are in the magnitude 3–4 range, large enough to have been felt by many people, yet small enough to rarely cause damage. the change in the number of earthquakes prompts two important questions: first, are the earthquakes natural or manmade? second, what should be done in the future as we address the causes and consequences of these events to reduce associated risks? adapted from united states geological survey, \induced earthquakes\

Question

select the best evidence to support the statement 	here has been a large increase in the number of earthquakes since the 1970s.\ there may be more than one correct choice. within the central and eastern united states, the number of earthquakes has changed dramatically over the past few years. between the years 1973–2008, there was an average of twenty - one earthquakes of magnitude three and larger in the central and eastern united states. this rate jumped to an average of ninety - nine magnitude three or larger earthquakes per year in 2009–2013, and the rate continues to rise. in 2014, alone, there were 659 magnitude three and larger earthquakes. most of these earthquakes are in the magnitude 3–4 range, large enough to have been felt by many people, yet small enough to rarely cause damage. the change in the number of earthquakes prompts two important questions: first, are the earthquakes natural or manmade? second, what should be done in the future as we address the causes and consequences of these events to reduce associated risks? adapted from united states geological survey, \induced earthquakes\

Accepted Answer

# Brief Explanations:
To support the statement about a large increase in earthquakes since the 1970s, we look for data showing a rise over time. The text provides:
- From 1973 - 2008, the average number of magnitude 3+ earthquakes in central/eastern US was 21 per year.
- From 2009 - 2013, this average jumped to 99 per year.
- In 2014 alone, there were 659 magnitude 3+ earthquakes.
These data points (comparing pre - 2009 averages to later periods) show a significant increase, so the relevant evidence is the comparison of earthquake counts across different time periods (1973 - 2008, 2009 - 2013, and 2014) in the central and eastern US.
# Answer:
The evidence is: "Between the years 1973 - 2008, there was an average of twenty - one earthquakes of magnitude three and larger in the central and eastern United States. This rate jumped to an average of ninety - nine magnitude three or larger earthquakes per year in 2009 - 2013, and the rate continues to rise. In 2014, alone, there were 659 magnitude three and larger earthquakes."

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