Types of waves

2. • GET THINKING!
• What’s going on in the photograph?
• Should we be concerned?
• Why might we be concerned?
• Do things change at this location?
• Do those waves do anything to the
coastal environment?

3. Big Picture
Waves
• The cause of waves
• Why some waves are
stronger
than others?
• Constructive and destructive
waves
How and where Do Waves Form?
LO: To understand about the formation of waves and their
characteristics.
Waves
 Ripples in the sea caused by the
transfer of energy from the wind
blowing over the surface of the
sea.
Key Vocabulary
Page 92 -93
14 March 2019

4.  You can describe how a wave forms and what happens as it
approaches the coast.
 You use a limited range of specialist terms
 You have a reasonable accuracy in the use of spelling,
punctuation and grammar.
 You can draw diagrams of constructive and destructive waves.
 You use a good range of specialist terms
 You have a considerable accuracy in spelling, punctuation and
grammar.
 You can compare the characteristics of constructive and destructive waves..
 You use a wide range of specialist terms where appropriate.
 Accurate use of spelling, punctuation and grammar.
Learning Outcomes – Success Criteria
L3 - Detailed
Answer
L2 - Clear
Answer
L1 - Basic
Answer
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

5. Produced by Mr M Colclough
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

6. How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.
How do waves form?
ACTIVATE
Waves are formed when ____________ ____________ over
the sea. This causes ____________ with the ____________
of the water which results in the formation of small
____________ which develop into ____________. The
____________ the ____________ ____________ over water
is known as the ____________. The longer the
____________, the more ____________ the wave.
Waves can also form when ____________ and
____________ eruptions shake the seabed. These types of
waves are called ____________ waves.
What happensas the wave approaches the coast?
Despite the wavy surface in the open sea, there is ____________ ____________ movement of
water. This only occurs when the waves ____________ and ____________ up the beach.
As the water starts to get ____________, the seabed interrupts the ____________ motion of the
waves making them more ____________. This causes the ____________ of the wave to rise
upwards and eventually ____________ onto the beach. The water that rushes up the beach is
known as the ____________, the water that flows back towards the sea is known as the
____________.
1) Draw an arrow on the diagram to show the direction of the waves.
2) Add the labels swash and backwash in the correct boxes.
Complete the descriptions using the information cards.
Using your knowledge from the video and
also using the information on the next
two slides, fill in every section on the
Activate Sheet.
We will check the answers shortly
afterwards.

7. • Waves form when the wind blows
over the sea. Friction with the surface
of the water causes small ripples in the
water, which develop in to waves. The
distance the wind blows across the
water is called the fetch. The longer
the fetch, the more powerful the
wave.
• Waves can also be formed when
earthquakes and volcanic eruptions
shake the seabed. These waves are
known as tsunami waves.
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

8. • Despite the relatively wavy surface in the open sea, there is little
horizontal movement of water. This only occurs when the waves break
and surge up the beach as they approach the shore.
• As the water gets shallower, the seabed interrupts the circular motion of
the water making the waves more elliptical. This causes the crest of the
wave to rise up and eventually collapse onto the beach. The water that
rushes up the beach is called the swash and the water that flows back
towards the sea is called the backwash.
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.
What Happens When Waves Reach
the Coast?

9. What is need for a ripple to form and develop into a wave?
A) Wind B) Hot air C) Distance
What does fetch mean?
A) The movement of water up the beach
B) The distance the wind blows across the water
C) Shallow water interrupting circular motion of waves.
Which statement is true?
A) The longer the fetch, the more powerful the wave.
B) The shorter the fetch, the more powerful the wave.
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.
Extension Task: Answer the questions in
your exercise book
Subtitle: Question Time

10. Draw two
diagrams in your
book; one to
show constructive
waves and
another to show
destructive
waves. You may
use p93 in the
text book or the
diagrams on this
slide.
Constructive Wave
Destructive Wave
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

11. Produced by Mr M Colclough
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.
Constructive Wave

12. Produced by Mr M Colclough
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.
Destructive Wave

13. Glue the table into your books and use your diagrams to compare
the characteristics of constructive and destructive waves.
Wave Characteristic Constructive Wave Destructive Wave
Wave height
Wave length
Wave Frequency
Type of wave break (spilling
or plunging)
Strength of Swash
Strength of backwash
Net beach sediment (gain or
less)
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

14. Compare the characteristics of constructive and
destructive waves [4].
One feature of a constructive wave is……..another
feature is……..Whereas destructive waves
have……they also have………….
Exam Style
Question
L2 - Clear
Answer
Produced by Mr M Colclough
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.

15. Compare
Command Words
Identify similarities and
differences between
two or more things.
Making the Grade:

16. Compare the characteristics of
constructive and destructive waves [4].
Exam Style Question
Lets listen to
some answers
Level 1 Basic (1 – 2 marks)
 Describes characteristics.
 Differences are not clearly described.
 No comparative language has been used.
 Only given characteristics of one type of wave.
Level 2 Clear (3– 4 marks)
 Must give characteristics of both constructive and
destructive waves.
 Must use comparative languages (whereas,
however, in contrast, compared with).
L2 - Clear
Answer
L1 - Basic
Answer
How and where Do Waves Form?
LO: To understand about the formation of waves and their characteristics.