Question

what effect does composting have on household waste streams?
composting produces rich mulch for gardens.
composting raises awareness about levels of household waste.
home composting reduces materials for municipal recycling.
composting can reduce the amount of a households trash.

Explanation:

Composting involves decomposing organic waste. When households compost, they divert organic materials (like food scraps, yard waste) from the trash. This directly means less waste going into the household's trash bin. While producing rich mulch (first option) is a benefit of composting, it's about the end - product for gardens, not the effect on waste streams. Raising awareness (second option) is more of an indirect or educational aspect rather than a direct effect on the waste amount. Home composting reducing materials for municipal recycling (third option) is incorrect because composting and recycling are different processes for different types of materials (composting for organic, recycling for materials like plastics, metals, etc.).

Answer:

Composting can reduce the amount of a household's trash.