What percentage of the human brain is composed of water?
Water - A Precious Natural Resource

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Biology
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6th - 8th Grade
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
80%
60%
50%
70%
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which activity uses the most water in households?
Personal hygiene
Flushing the toilet
Household cleaning
Cooking
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What percentage of Earth's surface is covered with water?
One-third
Half
Three-fourths
Two-thirds
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is most of the water on Earth not suitable for drinking?
It is underground
It is frozen
It is saline
It is polluted
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the approximate percentage of fresh water available for human use?
2%
3%
0.5%
1%
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main source of drinking water supplied to homes?
Surface water and groundwater
Desalinated water
Rainwater
Ocean water
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does groundwater get stored underground?
It is transported from lakes
It is pumped from rivers
It seeps into the ground and is stored above a hard rock layer
It is collected from rainwater
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