GENERAL
What gas do plants take in to produce oxygen?
Carbon dioxide (CO₂)
What is the main cause of air pollution?
Burning fossil fuels such as coal, oil, and natural gas.
What phenomenon occurs when greenhouse gases trap heat in the Earth’s atmosphere?
The greenhouse effect.
How long does it take for a plastic bottle to decompose?
Approximately 450 years.
Why is the ozone layer important?
It protects life by blocking harmful ultraviolet (UV) radiation from the Sun. It contains high concentrations of ozone (O₃).
What is eutrophication?
Eutrophication is the excessive nutrient enrichment of water bodies, often from agricultural runoff, leading to algal blooms and oxygen depletion.
What are invasive species, and why are they a problem?
Invasive species are non-native organisms introduced to an ecosystem, where they often outcompete native species, disrupt ecosystems, and cause ecological harm.
Which country is the leading producer of wind energy?
China
Which layer of the Earth’s atmosphere contains the ozone layer?
The stratosphere.
What type of pollution is caused by excessive artificial light?
Light pollution
The study of the relationship between the environment and the living communities is called?
Ecology
What percentage of coral reefs have been lost in the last 30 years?
50%
What is a renewable energy source, and can you name three examples?
Renewable energy sources are those that are naturally replenished, such as solar, wind, hydro, geothermal, and biomass energy.
What is the leading cause of deforestation?
Agricultural expansion, logging, and infrastructure development are the primary causes of deforestation.
What kind of food is thrown away the most in Estonian homes?
* Dairy products and eggs
* Vegetables
* Bread, pastries, bakery products
Vegetables (approx 32% of total loss of food)
Bananas can purify water. True or false?
Banana peels can remove heavy metals and pollutants from water, acting as a natural filter.
Which of the following is NOT a greenhouse gas?
* Carbon dioxide (CO2)
* Methane (CH4)
* Oxygen (O2)
* Nitrous oxide (N2O)
Oxygen (O2)
What is the term for the gradual increase in the Earth’s average temperature due to human activities?
Climate change
What is the process of converting barren land into forests called?
* Reforestation
* Afforestation
* Deforestation
Afforestation
The sound above what level is considered as harmful?
above 80 db