YR7 EoY revision Flashcards
(39 cards)
What is fetch?
The length of water over which the wind has blown.
Fetch is a critical factor in wave formation, influencing wave size and energy.
What factors influence wave size and energy?
The strength of the wind, the duration it blows, and the distance of the fetch.
A stronger and longer wind over a greater fetch leads to bigger waves.
How do waves alter our coastline?
Waves shape the coastline through processes of erosion and deposition.
Climate change can impact these coastal processes and landforms.
What is the difference between constructive and destructive waves?
Constructive waves have a strong swash and weak backwash; destructive waves have a weak swash and strong backwash.
Constructive waves build up beaches, while destructive waves remove sediment.
What type of wave has a weak swash and strong backwash?
Destructive waves.
These waves are steep and close together, leading to significant erosion.
What type of wave has a strong swash and weak backwash?
Constructive waves.
These waves are low and further apart, contributing to the building of beaches.
Fill in the blank: The stronger the wind is and the __________ it blows for, the __________ the distance of the fetch, the __________ the waves will be.
longer; further; bigger.
How does the wind affect wave formation?
The wind drags down on the surface of the sea, causing water to move in a circular motion.
This motion changes to an elliptical orbit as the water shallows.
What happens when the wave reaches shallow water?
The bottom of the wave touches the sand, slows down, and the top becomes higher and steeper until it breaks.
This process leads to the formation of swash and backwash.
What is swash?
The water that runs up the beach after a wave breaks.
It is followed by backwash, which returns water to the sea.
What is backwash?
The water that returns to the sea after swash.
It is influenced by gravity and can erode the beach.
What are the characteristics of constructive waves?
- Strong swash
- Weak backwash
- Low and further apart
These characteristics help to build up beach material.
What are the characteristics of destructive waves?
- Weak swash
- Strong backwash
- Steep and close together
These characteristics lead to sediment removal from the beach.
True or False: Constructive waves create a steep beach.
False.
Constructive waves create a gentle beach.
True or False: Destructive waves add sediment to the beach.
False.
Destructive waves remove sediment from the beach.
What happens to waves as they approach the shore?
They slow down and change from a circular to an elliptical motion.
This change is due to friction with the seabed.
What occurred at Holbeck Hall in June 1993?
A rotational landslide occurred, causing 1 million tonnes of cliff to fail and destroying the hotel at the top of the cliff.
The landslide happened over a couple of days and is an example of a rotational landslide.
Define a rotational landslide.
Rotational slides occur on curved surfaces where more resistant rocks are over underlying weaker rocks.
This geological phenomenon is characterized by the rotation of earth material along a curved surface.
What factors affected Holbeck Hall’s stability?
Holbeck Hall was affected by a number of factors including:
* Human causes
* Physical causes
Understanding both human and physical factors is essential for assessing the risks of living in coastal areas.
What is the main question for discussion regarding coastal living?
Nobody should be allowed to live in coastal areas. To what extent do you agree? If you agree, you must explain how you would make changes.
This question prompts critical thinking about coastal management and safety.
What are the steps to structure an assessment response about Holbeck Hall?
The assessment should include:
* Introduction
* Description of what happened
* Possible causes (human and physical)
* Conclusion on who/what is most responsible
This structure helps organize thoughts and arguments clearly.
What evidence is required to assess responsibility for the Holbeck Hall tragedy?
Top 5 pieces of important information about Holbeck Hall that will help decide who is responsible for the tragedy.
Gathering specific details will strengthen the argument in the assessment.
What is one of the emotional responses from those affected by the Holbeck Hall landslide?
The owner expressed being upset and disbelief at how fast everything happened.
Personal accounts provide insight into the human impact of natural disasters.