What pollution is impacting the ocean? - Lesson Two
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La durée de la leçon est: 45 minIntroduction
Lesson 2 – Microplastics – How do plastics break up?
This lesson looks at how plastics and other materials break up. Understand the terms compostable, biodegradable and degradable.
Learning activities:
Research what microplastics can be found at home and look at alternatives to replace them.
Experiment to see how long plastics last in the ocean.
Instructions
Time: 45 minutes
Contact: education@seashepherdglobal.org
© Sea Shepherd 2022
Éléments de cette leçon
Slide 1 - Diapositive
This lesson is provided by Sea Shepherd. Sea Shepherd was founded in 1977 and is a marine conservation organisation working to protect the oceans and marine wildlife. Sea Shepherd works globally on a range of issues impacting the oceans, running numerous direct action campaigns each year. Ocean pollution is one issue Sea Shepherd is working on to help stop marine wildlife dying.
Slide 2 - Diapositive
During the lesson we will use these icons to identify the learning actions.
Slide 3 - Diapositive
This lesson we will focus on solid pollution.
Ask students: “What do you think happens with the solid pollution out in the ocean?
Most of the everyday items we use, take a long time to break down in the ocean. Plastics will generally just break down into smaller pieces, called microplastics. They don’t fully disappear; it just makes it easier for smaller fish to eat them by mistake.
Ask students: “What do you think happens with the solid pollution out in the ocean?
Most of the everyday items we use, take a long time to break down in the ocean. Plastics will generally just break down into smaller pieces, called microplastics. They don’t fully disappear; it just makes it easier for smaller fish to eat them by mistake.
Slide 4 - Diapositive
To determine what happens to plastic pollution, we need to understand the terms – degradable, biodegradable and compostable.
Ask students if they know what each of these terms mean and then explain them.
Degradable - these items never completely disappear. Items such as plastic bags breakdown into smaller pieces over time but never completely go away leaving a harmful trail behind.
Biodegradable- means they can be broken up over time by microorganisms, however not all items advertised as biodegradable are completely harmless. They may contain chemicals, such as ink used for labels, which is left behind in the water after the labels have broken down.
Compostable - these items can be completely broken down and returned back to the earth, leaving no harmful traces behind at all. However, this may not be your backyard compost heap, many will require commercial composting.
Ask students if they know what each of these terms mean and then explain them.
Degradable - these items never completely disappear. Items such as plastic bags breakdown into smaller pieces over time but never completely go away leaving a harmful trail behind.
Biodegradable- means they can be broken up over time by microorganisms, however not all items advertised as biodegradable are completely harmless. They may contain chemicals, such as ink used for labels, which is left behind in the water after the labels have broken down.
Compostable - these items can be completely broken down and returned back to the earth, leaving no harmful traces behind at all. However, this may not be your backyard compost heap, many will require commercial composting.
Slide 5 - Diapositive
There are actually thousands of types of plastics made today, all with a specific purpose in mind. Most are made from chemical substances that, when submerged in water, could leach chemicals into the environment.
Up to 90% of marine debris is believed to be plastic based.
Most will be degradable. Which means that they will not disappear but will simply break up into smaller pieces and stay in the ocean.
Plastics can be hard, they keep their shape, or soft, they can be scrunched up, like food packing.
Both types can take a long time to break up into small pieces.
Up to 90% of marine debris is believed to be plastic based.
Most will be degradable. Which means that they will not disappear but will simply break up into smaller pieces and stay in the ocean.
Plastics can be hard, they keep their shape, or soft, they can be scrunched up, like food packing.
Both types can take a long time to break up into small pieces.
Slide 6 - Diapositive
Over time plastics will break up and become microplastics, but some products are created as microplastics.
Ask students if they know any examples.
Nurdles are small plastic pellets that are used to manufacture plastic products. This way the plastic is easier to transport and integrate into manufacturing than sheets or blocks of plastic. When containers full of plastic pellets are lost at sea, these plastic pellets are often found washing up on beaches and coastlines.
Ask students if they know any examples.
Nurdles are small plastic pellets that are used to manufacture plastic products. This way the plastic is easier to transport and integrate into manufacturing than sheets or blocks of plastic. When containers full of plastic pellets are lost at sea, these plastic pellets are often found washing up on beaches and coastlines.
Slide 7 - Diapositive
What microplastics can we find at home, that could easily be washed down the drain?
A lot of clothing is partially made of plastic. When these clothes are washed, small pieces of plastic start to break off and are washed down the drain. These are called microfibers.
Microbeads – these are small plastic beads that are used in things like facial cleansers, body scrubs and even toothpaste. Some countries are starting to ban these.
Glitter – most glitter is made from plastic, but new versions made from natural products are also available.
A lot of clothing is partially made of plastic. When these clothes are washed, small pieces of plastic start to break off and are washed down the drain. These are called microfibers.
Microbeads – these are small plastic beads that are used in things like facial cleansers, body scrubs and even toothpaste. Some countries are starting to ban these.
Glitter – most glitter is made from plastic, but new versions made from natural products are also available.
Slide 8 - Diapositive
This slide shows how long until some of the items break up to the size of a grain of sand – talk through some examples.
Slide 9 - Diapositive
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Slide 10 - Diapositive
Refer Teachers Guide for Learning Activities.
