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7a A source of life


1 Read  A . R e a d a n d m a t c h t h e q u e s t i o n s w i t h t h e a n s w e r s (
A. Read and match the questions with the answers (a-d).
Then, listen and check your answers.
T h e n , l i s t e n a n d c h e c k y ou r a n s w e r s .
1 I read somewhere that the human body is
& 2 Is it true that the Earth and Mars are the
75% water. Is that true?
Mike, Dorchester

only planets in our solar system with
water?
© MM Publications
Bob, Leeds
3 Where’s the deepest point in the sea?
This month find out Angie, St Ives

about WATER 4 A boy at school said that he could survive
without water for more than a month. Is
this possible?
a It’s in the Pacific Ocean, which is the largest Mary, Plymouth
ocean, containing 30% of all the water on the
Earth. The deepest point is called the Marianas B. Read again and write T for True or F for False.
Trench and it’s 10,918 m deep. By comparison, 1. A person who weighs 40 kg contains 70 litres
contains 70 litres
Mt Everest is 8,848 m high. You would need to of water.
put 29 Empire State Buildings one on top of the
other to get from the bottom of the Marianas 2. Mars is also called the Red Planet.
Trench to the surface!
3. Mt Everest is as high as 29 Empire State
Buildings one on top of the other.
b Well, there’s no water on the surface of
the Red Planet at the moment, but scientists 4. The Marianas Trench is in the Pacific Ocean.
examining Mars have found ice under the north 5. When your mouth feels dry, you can get dizzy
o
y
z
y
z
e
a
u
n g
c
t
di
and south poles. So, the Earth is the only planet or have blurred vision.
in our solar system with water on the surface.
Actually, 72% of its surface is covered by water.
C. Read the text again. Find words and match them
with the meanings below.
c Well, it’s not quite that much. The human
body is 50-65% water. This means that 1. the sun and all the planets that move around it
(question 2):
someone weighing 70 kg contains around 40
litres of water.
2. the top part of an area of sea or land (answer b):
d Well, a person can survive without food
for more than a month but you can only live 3. looking at something or someone very carefully
without water for approximately one week. To (answer b):
stay healthy you should drink 8 glasses of water
a day or even more if you live in a hot country 4. almost, about (answer d):
or do lots of exercise. Remember that when
your mouth feels dry, it means that you’ve 5. the opposite of wet (answer d):
lost between 6-10% of the water in your body.
That’s enough to make you dizzy or give you
blurred vision. 6. the ability to see (answer d):

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