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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
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.
29. Why are water jugs made of plastics? A. Plastics are rust proof. B. Plastics are strong and absorbent. C. Plastics are shiny and water proof. D. Plastics are good conductors of heat.
C. Plastics are shiny and water proof.
What are the components of 5Rs techniques?
Reducing, Reusing, Recycling, Recovering, Repairing
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
A. To solve or prevent environmental problems
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.
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.
The ability of materials to conduct electricity.
conductivity
The ability of materials to be broken into pieces.
brittleness
The ability of materials to be hammered into sheets.
malleability
Burning of paper(Physical or Chemical Change)
chemical change
. Drying fried fish under the sun(Physical or Chemical Change)
Physical Change
(Harmful or Useful) old newspapers
Useful
(Harmful or useful) expired medicine
Harmful
(harmful or Useful) fruit peelings
Useful
