Unit 9. Undersea world

?
countries
fruits
sports
transportation
jobs
animals
CAN YOU REMEMBER
ALL OF THEM?
Unit 9: UNDERSEAWORLD

READING
Before you read
• Work with a partner. Look at the map and give the Vietnamese names for the oceans on the map.
eal
ellyfish
urtle
hark
Watch the video clip and say what kind of animal it is.
1
2
3
4
Whale
Shark
Seal
Turtle
CHECKING VOCABULARY
- bay
- marine life
- mystery
- beneath
- submarine
- water current
- organism
- at stake = at risk
- vịnh
- cuộc sống dưới biển
- điều bí ẩn
- bên dưới
- tàu ngầm
- dòng nước
- sinh vật
- bị đe dọa
While you read
Read the text and do the tasks that follow.

There is only one ocean. It is divided into five different parts: the Pacific, Atlantic, Indian, Antarctic, and Arctic Oceans. There are also many other smaller seas, gulfs and bays which form part of them. Altogether they cover 75 percent of the earth`s surface. For centuries, people have been challenged by the mysteries that lie beneath the ocean.
However, today`s scientists have overcome many of the challenges of the depth by using modern devices. They send submarines to investigate the seabed and bring samples of marine life back to the surface for further study. Satellite photographs provide a wide range of information, including water temperature, depth and the undersea populations. If modern technology did not exist, we would never have such precious information.
Marine plants and animals fall into three major groups. Some of them live on or depend on the bottom like the starfish. Some are swimming animals such as fishes and sharks that move independently of water currents while others are tiny organisms that are carried along by the currents like the jellyfish. Plants and animals of the sea, however small or oversized, all contribute to its biodiversity. Unless this biodiversity were maintained, marine life would be at stake.
Task 1. The words in the box all appear in the passage. Fill each blank with one of them. There are more words than needed.



1. Some plants and animals are referred to as ___________ organisms because they are extremely small.
2. Thanks to modern technology, scientists have been able to ___________ the life of plants and animals that live under the sea.
tiny
investigate
oversized
samples
biodiversity
challenges
provide
gulf
3. A ___________ is a large area of sea that is partly surrounded by land.
4. ______________ is a term that refers to the existence of different kinds of animals and plants which make a balanced environment.
5. These scientists have collected different ___________ to analyse for their experiment.
tiny
investigate
oversized
samples
biodiversity
challenges
provide
gulf
1. What percentage of the earth`s surface is covered by seas and oceans?
75% of the earth`s surface.
2. How do scientists now overcome the challenges of the depth?
By using modern devices
3. What can submarines do to help scientists know about the undersea world?
They investigate the seabed and bring samples of marine life back to the surface for further study.
4. What can we learn from the satellite photos?
We can know a wide range of information, including water temperature, depth and the undersea populations.
5. What are the three groups of marine plants and animals?
They are those that live on or depend on the bottom like the starfish, those that move independently of water currents and those that are carried along by the currents.
6. What would happen if the sea biodiversity were not maintained?
Marine life would be at stake if the sea biodiversity were not maintained.
After you read
Work in pairs. Complete the summary of the reading passage by filling each blank with a word or phrase given in the box below.




Though covering (1) _____________ of the earth`s surface, the ocean has remained (2) _________ to us until recently. With (3) _________ technology we have now made important (4) _________ about the (5) ____________ of marine life. We have learnt that whether tiny or (6) _______, all the (7) ______________ of the sea are (8) ________________.
plants and animals
modern
discoveries
three–quarters
huge
mysterious
closely connected
biodiversity
FISH
MAMMAL
TINY ORGANISM
PLANTS
dolphin
shark
starfish
jellyfish
whale
Watch the video clip and do the task that follows.
BACK
Choose the correct option A , B , C or D
How many kinds of marine animals are there?
A. 5 B. 6 C. 7 D. 8
2. How many sharks did you see?
A. 1 B. 2 C. 3 D. 4
3. Why do many sea animals die?
Global warming B. to much water
C. Too many other animals D. no more air to live
4. Which animal did you see at the beginning?
A. fish B. jellyfish C. shark D. actinia

HOMEWORK
Find out some more kinds of undersea organisms.
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CAN YOU REMEMBER ALL OF THEM?
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