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| The leveling of sections of hills to reduce the amount of erosion |
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| Something that provides energy |
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| Energy sources that have some sort of value |
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| The disposal of refuse and other waste material by burying it and covering it over with soil |
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| Of, relating to, or produced by the internal heat of the earth |
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| Another term for garbage. |
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| A viscous liquid derived from petroleum, especially for use as a fuel or lubricant |
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| A combustible black or dark brown rock consisting mainly of carbonized plant matter |
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| A flammable substance of this type used as a fuel |
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| In the process of coal formation, this solid is formed at one point |
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| The process of renewing waste to be used again |
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| Relating to or denoting energy derived from the sun's rays |
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| The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects |
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| Denoting, relating to, or powered by the energy released in nuclear fission or fusion |
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