30. Why is wood an ideal material for building houses and furnitures? It is ______________. A. synthetic B. nonmetallic C. biodegradable D. rigid and tough
D. rigid and tough
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15
Burning of paper(Physical or Chemical Change)
chemical change
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trap
No points!
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gold
Win 50 points!
Okay!
fairy
Take points!
5
10
15
20
25
banana
Go to last place!
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15
(Harmful or Useful) old newspapers
Useful
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. Drying fried fish under the sun(Physical or Chemical Change)
Physical Change
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eraser
Reset score!
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fairy
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10
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25
shark
Other team loses 10 points!
Okay!
lifesaver
Give 25 points!
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15
What will happen to uncollected waste? A. It can produce waste. B. It can cause pollution. C. It can produce plastic. D. It can cause garbage.
B. It can cause pollution.
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15
26. Which explains why papers are used in writing? A. Papers are soft. B. Papers have the ability to dry up liquids like ink quickly. C. Papers are made of cellulose fibers that have absorbent property. D. Papers
Papers have the ability to dry up liquids like ink quickly.
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15
Why is it important to use the 5Rs technique? A. It can harm living things. B. It can produce more waste. C. It can pollute the environment. D. It can lessen the wastes every day.
D. It can lessen the wastes every day.
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baam
Lose 10 points!
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gold
Win 50 points!
Okay!
shark
Other team loses 25 points!
Okay!
baam
Lose 15 points!
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15
(harmful or Useful) fruit peelings
Useful
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15
The ability of materials to be hammered into sheets.
malleability
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15
What is the main reason for practicing the 5Rs? A. To solve or prevent environmental problems B. To worsen the environmental problems C. To throw the garbage everywhere D. To pile more trash in the landfill