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a natural resource or source of energy that is not depleted by use, such as water, wind, or solar power.
Ex: solar energy

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That it can be decomposed into natural chemical elements by the action of biological agents, such as the sun, water, bacteria, plants or animals.
Ex: food

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containing or being poisonous material especially when capable of causing death or serious debilitation
Ex: poison

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It is that material or product that can be recycled.
Ex: paper, plastic and glass

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the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.
Ex: iron

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relating to sight, especially in relation to the action of light.
Ex: glass of water

opaque: not able to be seen through; not transparent.

transparent: easy to perceive or detect.

semitransparent: partially or imperfectly transparent.

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Relating to heat or temperatures
Ex: toaster

thermic conductivity: the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field which causes the flow of current.

fusibility:the quality of being fusible or convertible from a solid to a liquid state by heat.

weldability: the capacity of a metal to be welded under the fabrication conditions imposed into a specific, suitably designed structure and to perform satisfactorily in the intended service.

expansion: the action of becoming larger or more extensive.

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Operated by a machine, or connected with machines  or their parts.
Ex: the wedged

elasticity: the ability of an object or material to resume its normal shape after being stretched or compressed; stretchiness.

plasticity: the quality of being easily shaped or moulded.

malleability: the quality or state of being malleable

ductility: the ability of a material to be drawn or plastically deformed without fracture.

hardness: the quality or condition of being hard.

tenacity: the quality or fact of being able to grip something firmly; grip.

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concerned with, operating by, or producing electricity.
Ex: a car battery

conductor: They are materials whose resistance to the passage of electricity is very low.

Non conductor: A substance that does not conduct heat or electricity. Most other minerals are non-conductors of electricity.