This is ace. Wolves were introduced back to Yellowstone National Park 70 years after they were last there. As a result the whole ecosystem was altered.
We often bang on in lessons about linking ideas together and how in real life there are so many knock on effects. Well have a look at this video and see for yourself
More wolves means less deer (especially in the valley floors where they are easier to hunt down).
Less deer means less grazing. Less grazing means vegetation can grow more.
More vegetation means less soil erosion. Less soil erosion means less material in the rivers.
But more vegetation on the valley floors also means more stable river banks. More stable river banks means straighter rivers in places.
The animals the vegetation the ecosystem and the rivers are all interlinked
Here is the powerpoint from the lesson. We covered: why rivers flood, meanders & ox bow lakes and the Rutland Reservoir case study
I found this US video on this topic from our GCSE… it approaches the formation of meanders and ox bow lakes slightly differently and you might gain from seeing it from this different angle …..What could you take from this that could help you answer the questions “Describe the formation of an oxbow lake.” (4 marks)
and as a comp[ariosn here is a short video from Noel Jenkins an excellent UK geography teacher 🙂
style meanders</a> from <a href=”https://vimeo.com/user799823″>Noel
Jenkins</a> on <a href=”https://vimeo.com”>Vimeo</a>
I have written previously about answering those “using a diagram describe the formation ….” questions in the physical paper. you can find that here
One of the key aspects you need to get correct is the sequence (or order) of events and to get full marks you need the whole sequence from start to finish. I am attaching below a revision sheet to help you learn the sequence for the formation of :
- waterfalls and gorges
- V shaped valleys
- meanders and ox bow lakes
Revising River Landforms
Each part of the formation is included but is in the wrong order. you can revise this by simply working out the correct order and checking against your book, but it would also be a good idea to draw a diagram or series of diagrams to show the formation and use the statements on the sheets to annotate your drawing.
Finally you should then of course have a go at an exam question to check your learning. I have posted all the past exam questions previously and you can find them here
Here is a revision video guide on meanders and ox bow lakes. Covers how they are formed, what their main features are and how to answer an exam question on either of these river landforms