Final answer:
The word noxious means harmful, as it describes the materials in the lake that can cause damage or danger to living organisms.
Step-by-step explanation:
The word noxious in the sentence means harmful.
It describes the materials found in the lake, such as cleaning agents and pesticides, which can cause damage or danger to living organisms.
For example, cleaning agents can pollute the water and harm aquatic life, while pesticides can be toxic to both animals and plants.
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