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