Environmental Impact on Baltic Sea

Eutrophication is a major environmental issue in the Baltic Sea, caused by nutrient runoff from agriculture. Fertilizers containing nitrogen and phosphorus enter the sea, leading to algae and cyanobacteria blooms. These blooms reduce water clarity and oxygen levels, creating dead zones where marine life cannot survive. The video emphasizes the collective responsibility to protect the Baltic Sea.

What is the primary environmental challenge faced by the Baltic Sea?

• Overfishing

• Deforestation

• Climate Change

• Eutrophication

Which compounds in fertilizers contribute to the environmental issues in the Baltic Sea?

• Nitrogen and Phosphorus

• Sulfur and Chlorine

• Carbon and Oxygen

• Hydrogen and Helium

How do nutrients from fertilizers end up in the Baltic Sea?

• Through ocean currents

• Carried by rivers

• Via atmospheric deposition

• Through direct dumping

What effect do algae and cyanobacteria blooms have on water clarity?

• Increase clarity

• No effect

• Reduce clarity

• Change color

Why is sunlight important for the deeper layers of water?

• For water purification

• For heating the water

• For photosynthesis

• For fish visibility

What happens to dead algae and cyanobacteria after blooms end?

• They float on the surface

• They evaporate

• They sink to the bottom

• They dissolve in water

What is the role of aerobic bacteria in the decomposition process?

• They produce oxygen

• They consume oxygen

• They release nitrogen

• They create nutrients

What harmful substance is released by anaerobic bacteria during decomposition?

• Ammonia

• Hydrogen sulfide

• Methane

• Carbon dioxide

What are 'dead zones' in the context of the Baltic Sea?

• Zones with high salinity

• Oxygen-depleted areas

• Regions with no sunlight

• Areas with high biodiversity