Biologiska kretslopp, miljöproblem och klimatåtgärder: Vattnets, kolets, kvävets och fosforns roll

What are the three states of water?

Gas, solid, and liquid.

What is the process called when water changes from liquid to vapor?

Evaporation.

Why is it important to understand that only a small fraction of Earth's water is drinkable?

Only 3% of Earth's water is freshwater, and not all of it is suitable for drinking.

What percentage of the atmosphere is composed of carbon dioxide?

0.04%.

What is photosynthesis and what is its chemical formula?

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce oxygen and glucose. The formula is H2O + CO2 + sunlight → O2 + C6H12O6.

What is cellular respiration?

It is the process by which cells use oxygen and sugar to create energy.

What forms when dead organisms are compressed over millions of years?

Fossil fuels such as oil, natural gas, and coal.

Why can't most organisms utilize nitrogen gas directly from the atmosphere?

Most organisms cannot use nitrogen gas due to its strong bonds, but some bacteria can.

How does nitrogen return to its gaseous form in the nitrogen cycle?

Through bacteria that convert nitrates back into nitrogen gas.

How is phosphorus released from rocks?

Through weathering, which breaks down rocks due to environmental factors.

What form of phosphorus do organisms use?

Phosphate, with the chemical formula PO4^3-.

Where do plants obtain their phosphate?

From the soil through their roots.

How are nitrogen and phosphorus used in agriculture?

They are used as fertilizers to help plants grow faster.

What environmental problem arises when nitrogen and phosphorus levels are too high?

Eutrophication, which leads to algal blooms and oxygen depletion, causing fish and other aquatic life to die.

What is the greenhouse effect?

It is the trapping of solar radiation in the atmosphere by greenhouse gases.

Why is the enhanced greenhouse effect a climate problem?

It can lead to warmer climates, melting ice, and weather disasters.

How do human activities contribute to the enhancement of the greenhouse effect?

Through the burning of fossil fuels in industries and deforestation.

What are two solutions to mitigate the enhanced greenhouse effect?

Individuals can use public transport and reduce meat consumption; societies can invest in renewable energy and reforest.

Why is the forest an important resource for balancing carbon dioxide levels?

Trees absorb CO2 during photosynthesis, reducing atmospheric carbon dioxide.

What are two causes of ocean acidification?

CO2 emissions dissolving in the ocean and forming carbonic acid, lowering pH levels.

What can individuals, societies, and governments do to reduce the impact of ocean acidification?

Individuals can reduce car use, societies can promote public transport, and governments can enforce stricter emission regulations.

What is eutrophication and its consequences for lakes and oceans?

Eutrophication is when excess nutrients like nitrogen and phosphorus lead to algal blooms, resulting in oxygen depletion and dead aquatic life.

What are two causes of eutrophication?

Fertilizer runoff from agriculture and nutrient emissions from industries.

What can be done to reduce the impact of eutrophication?

Individuals can avoid harmful products, societies can improve wastewater treatment, and governments can regulate fertilizer use.

Why is biodiversity important?

Biodiversity is crucial for ecosystem health; its loss can lead to species extinction and ecosystem imbalance.

What are some causes of declining biodiversity today?

Deforestation, climate change, pollution, and overfishing.

What can we do to help preserve biodiversity?

Recycle to protect wildlife, shop sustainably, and create laws to protect endangered species.