Which of the following describes a sign on the water surface consistent with HAB?

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Multiple Choice

Which of the following describes a sign on the water surface consistent with HAB?

A visible scum or film on the water surface is a common sign of a harmful algal bloom. When blooms develop, algae can concentrate at the surface and form a greasy-looking layer, films, or mats that may appear green, brown, or reddish and sometimes have an odor. This surface evidence stands out as a warning sign for potential HAB and possible toxins. In contrast, clear blue water, a glassy surface, or smooth water suggest clean water and calm conditions rather than a bloom, so they aren’t indicative of HAB.

A visible scum or film on the water surface is a common sign of a harmful algal bloom. When blooms develop, algae can concentrate at the surface and form a greasy-looking layer, films, or mats that may appear green, brown, or reddish and sometimes have an odor. This surface evidence stands out as a warning sign for potential HAB and possible toxins. In contrast, clear blue water, a glassy surface, or smooth water suggest clean water and calm conditions rather than a bloom, so they aren’t indicative of HAB.

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