Answer:
Prime cause of solid waste.
Step-by-step explanation:
The water bottles are generally made up of PET (polyethylene terephthalate).
PET is a non biodegradable plastic.
So when we discard a water bottle randomly, it may find places like soil, rivers, lake, oceans etc.
The nature is not able to degrade the PET polymer and hence the water bottles remain their and cause solid waste problem or solid waste pollution.
The eventual fate is cause of pollution.
They may cause serious problems in the BOD of water resources as they may float over the water surface.
They may enter in the body of animals feeding on the soil (like cow feeding on waste material) or aquatic animals like fishes.