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- 1. Multiple Choice
What percentage of Earth's surface is covered with water?
10%
25%
70%
90%
- 2. Multiple Choice
How much water does one person require to meet basic needs every day?
5L
9L
14L
25L
- 3. Multiple Choice
How long ago did marine cyanobacteria start releasing oxygen into our atmosphere?
a few weeks ago
3 million years ago
3 billion years ago
3 trillion years ago
- 4. Multiple Choice
What percentage of Earth's total water is accessible fresh water?
0.5%
5%
10%
15%
- 5. Multiple Choice
What is the chemical formula of water?
HO
HO2
CO2
H2O
- 6. Multiple Choice
How many molecules of water make up a single drop of water?
10
10,000
one million
one billion billion
- 7. Multiple Choice
True or False? Water is known as the universal solvent.
True
False
- 8. Multiple Choice
What toxins can contaminate water?
heavy metals
organic wastes
disease-causing organisms
all of these
- 9. Multiple Choice
True or False? Humans have been able to survive almost everywhere on Earth because water is so readily available.
True
False
- 10. Multiple Choice
What does water do better than any other liquid?
dissolves substances
make is thirsty
freeze
boil
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