Cette leçon contient 10 diapositives, avec quiz interactif et diapositives de texte.
La durée de la leçon est: 45 min
Introduction
Lesson Three – What is a gyre?
This lesson discusses what a gyre is, and how trash is moved around the ocean.
Learning activities:
Research and discussion exercises on how currents flow into gyres and how trash is moved around.
This lesson is provided by Sea Shepherd. Sea Shepherd is a marine conservation organisation with a mission to protect the ocean and marine wildlife. Sea Shepherd works globally on a range of issues impacting the ocean, running numerous direct action campaigns each year. Ocean pollution is one area Sea Shepherd is addressing in order to protect marine wildlife.
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Slide 2 - Diapositive
During the lesson we will use these icons to identify the learning actions.
Introduction to IUU fishing and the impact of overfishing.
Where does trash go?
Slide 3 - Diapositive
Ask students “Once trash is picked up by an ocean current where do you think it goes? “
Introduction to IUU fishing and the impact of overfishing.
Ocean gyres (jai-uh)
Slide 4 - Diapositive
Once trash enters the ocean it is picked up by the ocean currents and is moved into the gyres (pronounced jai-uh). Gyres are areas in the ocean where currents meet, and it creates a circular movement.
Over 100 million tons of fish caught each year.
Five gyres and ocean currents.
Slide 5 - Diapositive
There are five main gyres in the ocean, one in each area of the ocean – North & South Atlantic, North & South Pacific and Indian Ocean.
The North Pacific gyre is one of the worst with thousands of square kilometers of rubbish. It’s hard to estimate the size because much of the rubbish is floating just below the surface.
Introduction to IUU fishing and the impact of overfishing.
North Pacific gyre
Slide 6 - Diapositive
The North Pacific gyre is one of the worst with thousands of square kilometers of rubbish, mainly plastics, caught in the gyre. t’s hard to estimate the size because much of the rubbish is floating just below the surface.
What happens to trash caught in the gyre?
Slide 7 - Question ouverte
Ask students “What do you think happens with the trash that is caught in the gyre?”
Introduction to IUU fishing and the impact of overfishing.
What happens to trash in the gyres?
Slide 8 - Diapositive
The trash can stay there, getting moved around by the waves. It might break up into smaller pieces over time. It also might be moved around by weather and currents and end up being pushed back out of the gyre.