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1. 
Which major city could become the first to run out of water?
A.
Cape Town
B.
Tokyo
C.
Barcelona
D.
London
2. 
What percentage of Earth's water is salty?
A.
50%
B.
75%
C.
97%
D.
90%
3. 
How many people on Earth can count on having running water in their homes?
A.
Half
B.
Seven in ten
C.
All
D.
One in five
4. 
What is the main cause of Mexico City sinking?
A.
Groundwater extraction
B.
Earthquakes
C.
Climate change
D.
Urbanization
5. 
Which country has 10,000 times more water per capita than Kuwait?
A.
Qatar
B.
Australia
C.
Canada
D.
Saudi Arabia
6. 
What is the main consequence of draining Mexico City's lakes?
A.
Flooding
B.
Drought
C.
Pollution
D.
Water scarcity
7. 
What is the term used for the deposits of water underground?
A.
Ponds
B.
Cisterns
C.
Reservoirs
D.
Aquifers
8. 
Which city has a population of 22 million people?
A.
New York City
B.
Mexico City
C.
Tokyo
D.
Shanghai
9. 
What is the main threat to Mexico City's water supply?
A.
Over-extraction of groundwater
B.
Climate change
C.
Pollution
D.
Lack of rainfall
10. 
What is the term used for the day when a city runs out of water?
A.
H2O Drought
B.
Day Zero
C.
Dry Day
D.
Water Crisis Day