Algal Bloom

Dead zones are regions in a body of water where:

• Salt water is mixed with fresh water

• Decomposer microbes have multiplied and are using up oxygen

• Nutrients from runoff are promoting floating algae growth

• No plants are able to grow because of a lack of sunlight

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What are algal blooms and what causes them?

Answer explanation

Algal blooms are rapid increases in algae in water bodies, often caused by nutrient pollution (like nitrogen and phosphorus) from fertilizers, wastewater, and runoff. These blooms can harm aquatic life and water quality.

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What are the effects of algal blooms on aquatic ecosystems?

Answer explanation

Algal blooms can deplete oxygen in water, leading to dead zones where aquatic life cannot survive. They also produce toxins that harm fish and other organisms, disrupting the balance of aquatic ecosystems.

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What role does phosphorus play in eutrophication?

Answer explanation

Phosphorus is a key nutrient that, when in excess, promotes algal blooms in water bodies. This leads to eutrophication, depleting oxygen and harming aquatic life as the algae die and decompose.

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What are the consequences of consuming shellfish affected by red tides?

Answer explanation

Consuming shellfish affected by red tides can lead to shellfish poisoning, which may cause symptoms like nausea, vomiting, and neurological issues. It's crucial to avoid eating shellfish during red tide events to prevent health risks.

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What are the sources of nitrates that contribute to cultural eutrophication?

Answer explanation

Sources of nitrates contributing to cultural eutrophication include agricultural runoff, wastewater discharge, and fertilizers. These excess nutrients promote algal blooms, leading to oxygen depletion in water bodies.

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What are the main causes of eutrophication?

Answer explanation

The main causes of eutrophication are nutrient pollution, primarily from fertilizers, sewage, and runoff, which lead to excessive growth of algae in water bodies, depleting oxygen and harming aquatic life.

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How does human activity contribute to phosphorus pollution?

Answer explanation

Human activity contributes to phosphorus pollution primarily through agricultural runoff, wastewater discharge, and the use of fertilizers, which increase phosphorus levels in water bodies, leading to eutrophication.

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What is an algal bloom?

• A rapid increase in the population of algae in water systems

• A type of plant growth on land

• A seasonal change in water temperature

• A decrease in water pH levels

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Which nutrient is most commonly associated with the cause of algal blooms?

• Nitrogen

• Phosphorus

• Potassium

• Calcium

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