Activity Overview: Students may watch the garbage people come by and think that their waste magically disappears. Some may have been to the dump with a parent and some may have a compost pile or “dump” of their own on their land.
Organic products like food waste, cotton clothing, and paper break down quickly (usually within one year). Highly processed organic products such as processed timbers and leather may take several decades, but will still break down since they are made from basic natural compounds.
Aluminum cans can take up to 500 years to break down in a landfill, but are easily recycled and are collected in many towns. Glass can also be easily recycled in 8-10 weeks, but will take millions of years to break down and requires physical crushing to do so. Plastic bottles and foam plastic cups take millions of years to break down. These are made from polymers and petroleum products.
Time: 30 minutes for Activity One; 1 day research, plus 45 minutes to discuss Activity Two
Using a map of the area, show the students the location of your local landfill. Ask if anyone has ever been there and have someone share his or her experience with the class. Using the map again show them the location of the recycling center. Solicit stories or feelings about use of this location or curbside pickup.
Next, show the students a selection of products from the list below and have them talk about how the items are used and misused. Feel free to substitute other items in each category that your students may be in contact with each day.
Fill out the chart by making educated guesses on how long it takes for these items to completely break down when buried. This can be done as a group activity on the board or as an individual activity.
|Objeto||0–1 año||2–100 años||100–500 años||500–1,000 años||1,000–1,000,000 años|
|Lata de aluminio|
|Corazón de una manzana|
|Camiseta de algodón|
|Botella plástica de agua|
|Caja de cartón de cereal|
|Sandalia de cuero|
|Tren de juguete de madera|
|Frasco de cristal|
|Vaso de poliestileno|
Have the students split into 10 small groups or pairs and have each group choose one item from the list to research. Using the websites listed in the resource section or books from your library, have them answer the discussion questions below. Have the students share their findings with the group and discuss ways they can throw away less of the materials that take longest to break down.