SOLAR ENERGY IN THE US

Grade level: 3rd – 5th grades

Skills: Addition & Subtraction (Decimal numbers)

Related environmental issues: Energy /  Renewable Energy

The table below shows shows how much new solar power was installed the United States each year between 2008 and 2017. Solar power means electricity generated by solar panels.

1 Gigawatt = 100,000,000 kilowatts (With 1 gigawatt of solar power, we can power 190,000 homes!)

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1. Which year has the largest number?

2. What is the difference between the numbers of the years 2014 and 2015?

3. Is the amount of solar panels installed in 2011 more than those installed in 2009 and 2010 combined or less?

4. What is the difference between the largest number and the smallest number?

5. Which year has the number 4.4 larger than  0.38?

6. Which two numbers make the largest value when added?

Sources:

 

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Answer keys

  1. 2016
  2. 7.5 – 6.24 = 1.26
  3. More : 1.92 > (0.38 + 0.85)
  4. 15.13 – 0.3 = 14.83
  5. 2013
  6. 15.13 and 10.61

 

What country sends no trash to landfills?

Grade level: 3rd – 5th grades

Skills: Bar graphs

Related environmental issues:Waste / Recycle

Disposing of waste at landfills causes pollution that can contaminate the air, surface, ground water, and soil. In addition, waste produces significant amount of methane, i.e., one type of greenhouse gases, during waste treatment and disposal, and substantially contributes to global climate change.

The bar graph below shows what percentage of trash is sent to landfills in 7 countries with the largest economies in the worlds.

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1. Which country sends the largest percentage of trash to landfills?

2. Which country sends no trash to landfills?

3. Many countries recycle or incinerate to reduce the amount of trash sent to landfills. What percentage of trash does United Kingdom recycle or incinerate ?

4. Among the 7 countries, how many countries send less than one third of trash to landfills?

Sources: OECD, 2015. Environment at a Glance 2015, Table 1.12. Municipal waste disposal and recovery shares, 2013 or latest.

Table 1.12. Municipal waste disposal and recovery shares, 2013 or latest

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Answer keys

  1. Canada
  2. Germany*
  3. 100 – 34 = 66
  4. three (Japan, Germany, and France)

*Germany recycles 65% of its waste and incinerates the rest of the waste