Natural
Sources: plant decomposition releases oils that create bubbles in turbulent and wavy waters
What to look for: windy weather, or turbulent water, plant decomposition. The foam is light and not shiny. May have a brownish tint.
Pollution
Sources: industry (paper production, textile and oil industries), fire fighting
What to look for: factories nearby, foam is a shiny, bright white and may be slimy.
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