Which state increased its wind power the most–California, Iowa, or Oklahoma?

Grade level: 3rd – 5th grades

Skills: Line graph 

Related environmental issues: Energy 

The line graph below shows how California, Iowa, and Oklahoma states increased their wind power over the past 5 years.

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  1. Among the three, which state increased its wind power the most over the past 5 years?
  2. Which state had the most wind power in 2013 and the least in 2017?
  3. Between what years did the wind power in Iowa overtake that in California? A) between 2013 and 2014  B) between 2014 and 2015  C) between 2015 and 2016  D) between 2016 and 2017


Sources: U.S. Department of Energy, 2018. U.S. Installed and Potential Wind Power Capacity and Generation


Answer keys

1. Oklahoma

2. California

3. B



Why do we use more water in summer than in winter?

Grade level:  3rd – 5th grades

Skills: Line graphs

Related environmental issues: Water

The line graph below shows the average daily household water use per person in California in 2016.

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  1. In what season did a person in California use the largest amount of water?
  2. On average, a person in California used 85 gallons of water per day in 2016. In what months, did average Californians use about 85 gallons of water per day?
  3. In which month did a person in California use less amount of water per day, January or December?
  4. Between which two consecutive months did average water use increase the most?
  5. People use the largest amount of water in July and August in most of the states. Why do you think more household water is needed in those months?  Select all of the answers that apply. A) Rising outdoor water use for lawn and landscape watering B) Running the water to avoid freezing water pipes C) Increasing water use for outdoor water activities


Sources: California Water Boards, 2017. Fact Sheet (February 8, 2017)


Answer keys

  1. summer
  2. May
  3. January
  4. May and June
  5. A and C