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Across
  1. 4. A process by which organic matter, such as leaves and food scraps, decomposes into soil.
  2. 5. A product left behind after a chemical reaction, often referring to the remains or contaminants after a given class of events.
  3. 6. Animals kept or raised on a farm to earn income, produce labor, and other commodities.
  4. 7. The process of collecting and processing materials that would otherwise be thrown away as trash and turning them into new products.
Down
  1. 1. A chemical used in agriculture, such as a pesticide or a fertilizer.
  2. 2. Materials that are not needed and are discarded. This includes materials from households, industries, and agriculture⁵².
  3. 3. A form of renewable energy derived from recently living organic materials known as biomass, which can be used to produce transportation fuels, heat, electricity, and products⁴⁹.
  4. 8. A plant or plant product that can be grown and harvested for profit or subsistence