a chemical, a substance used in chemistry, the climate, the weather conditions in an area or in the world, energy, power that comes from fuel such as electricity or gas, the environment, the air, land, water and plants of the world, a flood, a large amount of water that covers an area that should be dry, fuel, a substance that we burn to provide energy or heat, pollution, harmful substances that cause damage to the environment, the population, the number of people in a country or area, to recycle (something), to take used materials such as glass and paper and change them so that they can be used again, a scientist, someone who studies science, transport / transportation, the system of vehicles that gets people or goods from one place to another, coal, a black substance that we dig from the ground and use as fuel, electricity, a form of energy that we use for things like lights, TVs or heating, gas, a substance like air that we use as fuel, oil, a thick liquid that comes from under the ground and we use as fuel.

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