recognizing useful and harmful materials

Anything that occupies space.

• globe

• matter

• environment

• surroundings

When is a material useful?

• When the material serves a purpose.

• When the material brings hazards.

• When the material brings harm.

• When the material is toxic.

Among the 4 options, which is considered useful?

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When is a material harmful?

• When the material can be used many times.

• When the material gives other uses aside from its purpose.

• When the material can be used in cooking.

• When the material brings danger to people and environment.

Which picture is an example of a harmful material?

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When is a material considered waste?

• When the material is still another use.

• When the material served its primary use and can be discarded.

• When the material can be repaired.

• When the material can be recovered and be used a fuel.

Which of the following is a biodegradable waste?

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What happens to biodegradable waste when they are thrown?

• Melts by the sun

• Broken into pieces

• Decomposed by bacteria

• Flattened

Which of the following is a non-biodegradable waste?

• paper

• leaves

• rubber

• wood

Where do we place our garbage properly?

• in the river

• in the mountains

• in the landfills

• in the lakes