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.

Screen Shot 2017-10-03 at 11.22.18 AM

  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


Has the amount of trash increased or decreased?

Grade level:  4th – 5th grades

Skills: Creating and interpreting line graphs

Related environmental issues: Waste generation

The table below shows the amount of trash discarded in this country between 1960 and 2014.


  1. Make a line graph to represent the information in the table.


  2. Has the amount of trash increased or decreased over the last 50 years?
  3. Between which years did the amount of trash change the most?
  4. How much did the amount of trash increase between 1960 and 2010?

Sources: U.S. EPA


Answer keys

  1. screen-shot-2017-02-02-at-3-17-22-pm
  2. increased
  3. Between 1980 and 1990
  4. 251 – 88 = 163 (million tons)