Page 89 - Prime Time 1-5 Leaflet

1 What do you know about
tsunamis? What else would you
like to know? Write down
three questions.
Listen and read to see if you
can answer your questions.
2 Read and match the subheadings
(A-G) to the paragraphs (1-6).
There is one extra heading.
A A frequent phenomenon
B Happening one after the other
C High tide
D Deadly power
E A sudden movement
F Less by degree
G Below the surface
3 a) Complete the sentences with
words/phrases from the
box.
1 A tsunami can be caused by a(n)
.................................. underwater.
2 When the Earth’s ..........................
move suddenly, an earthquake
happens.
3 A tsunami is similar to throwing
a(n) ...................... into a lake, but
on a much larger ......................... .
4 When the water reaches the ........
................ and comes ............... it
destroys everything in its ........... .
5 A tsunami can ...............................
buildings and destroy ecosystems.
Check these words
4 Tell your partner four things you
have learnt about tsunamis.
b) Match the words in bold
with their meanings: small
stone, rockfall , pushed, first ,
long crack in the surface of
Earth, force, proportion, moves
like waves, enormous.
5 Collect more
information about tsunamis. Use
the key word: tsunami Present
your information to the class.
ICT
speed, undersea landslide, volcanic eruption, tectonic plates, fault
line, slide, force, pebble, ripple, outwards, shore, come inland, fast
tide, impact, in its path, initial, on a larger scale, tremendous
damage, loss of life, flatten, ecosystem
Check these words
A tsunami is a large wave that
travels at great speed towards
land. They are usually caused by
an undersea earthquake, but they
can also happen after a large
undersea landslide and an
underwater volcanic eruption.
When an undersea earthquake happens, the Earth’s tectonic plates move
suddenly downwards or upwards. This usually happens on a fault line and
one plate slides below the neighbouring plate causing a large amount of
water to be forced upwards.
This water forms a wave. Just like when you throw a pebble into a lake, the
water ripples outwards. It is the same with a tsunami, but the water doesn’t
stop moving until it reaches land.
As the wave moves towards the land, it increases in speed and strength. Not
all tsunamis are giant waves when they hit the shore, though. Many of them
come inland as a strong and fast tide. However, the impact of the water often
destroys everything in its path.
After the initial tsunami hits land, there are often other waves following it, that
can be just as big, which slowly get smaller over time. The same as the ripples
from the pebble mentioned before, but on a much larger scale.
Water is a very powerful force and can cause tremendous damage. As well as
the loss of life that a tsunami can cause, it can flatten buildings and trees and
destroy whole ecosystems.
1
2
3
4
5
6
How Tsunamis work
19
h 1
Curricular: Geography