Dead Zones Quiz

What are dead zones?

• Areas with high oxygen levels

• Low-oxygen areas in oceans and lakes

• Regions with high biodiversity

• Places with abundant marine life

What process leads to the formation of dead zones?

• Respiration

• Photosynthesis

• Evaporation

• Eutrophication

What causes red tides?

• High salinity

• Low water temperature

• Bloom of microscopic plankton

• Excessive fishing

Which nutrient is NOT mentioned as a cause of eutrophication?

• Potassium

• Nitrogen

• Phosphorus

• Carbon

What is the main cause of excess nutrients leading to dead zones?

• Volcanic eruptions

• Human activities

• Natural disasters

• Solar flares

Which region has one of the first identified dead zones?

• Baltic Sea

• Gulf of Mexico

• Black Sea

• Chesapeake Bay

What is an algal bloom?

• A rapid increase in algae and phytoplankton

• A decrease in water temperature

• A rise in fish population

• A type of underwater plant

What happens during hypoxia?

• Increase in oxygen levels

• Decrease in nutrient levels

• Organisms die from lack of oxygen

• Water becomes clearer

Which sea has the largest number of marine dead zones?

• Caribbean Sea

• Mediterranean Sea

• Red Sea

• Baltic Sea

What is a 'system in recovery'?

• A system that never had hypoxia

• A system with stable nutrient levels

• A system that is improving from low oxygen levels

• A system with increasing dead zones