Threats to oceans
Lesson details
Learning outcome
I can explain the main threats to oceans and how they affect marine environments.
Key learning points
- Plastic pollution harms marine life and spreads through ocean currents.
- Overfishing reduces fish populations and disrupts marine food chains.
- Climate change warms oceans and causes coral bleaching.
- Oil spills and chemical pollution damage marine ecosystems.
- Rising sea levels and acidification threaten coastal and ocean habitats.
Keywords
Ocean current - continuous movements of seawater in the ocean
Overfishing - catching too many fish, so the breeding population becomes too depleted to recover
Food chain - a sequence that shows how a group of living things are linked by what they eat
Ocean acidification - when the ocean becomes more acidic because it absorbs too much CO₂ from the air
Common misconception
Ocean acidification is when water is polluted from human activities on land.
Ocean acidification is when the ocean absorbs extra carbon dioxide (CO₂) from the air, which makes the water more acidic.
Teacher tip
Ask students to do some extra research on the 1996 Milford Haven Oil spill, looking at the causes and effects.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What does the term 'Anthropocene' describe?
Q2.Which of these is a human activity that directly contributes to climate change?
Q3.What is a consequence of overfishing?
Q4.Deforestation often reduces and increases CO₂ levels.
Q5.What does your carbon footprint measure?
Q6.Which of these is a sustainable action?
Assessment exit quiz
4 Questions
Q1.Match the keywords to their definitions:
Continuous movement of seawater
Catching too many fish to allow recovery
Shows who eats what in a group of living things
When seawater absorbs excess carbon dioxide (CO₂)
Q2.What causes ocean acidification?
Q3.A student says, "Ocean acidification is caused by pollution from land." What’s a better explanation?
Q4.What might happen if smaller fish are removed from a food chain?
To help you plan your 9 geography lesson on: Threats to oceans, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 9 geography lesson on: Threats to oceans, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 geography lessons from the Anthropocene: What is the impact of humans on the world? unit, dive into the full secondary geography curriculum, or learn more about lesson planning.