Earth Day brings together more than one billion people across 193 countries, making it the biggest civic environmental event in the world. Yet many people still don’t know simple facts about the planet they live on, from how recycling works to what causes climate change.
A quiz is one of the easiest ways to make environmental learning fun. Instead of reading through long explanations, people get to test their knowledge, compete, and discover new information along the way. Using an interactive quiz builder takes this experience to a whole new level by turning static questions into a live, engaging activity.
This collection of 100+ Earth Day quiz questions and answers helps make learning about the environment lively, memorable, and enjoyable for any group or event.
Multiple-Choice Questions
Q1. When is Earth Day celebrated every year?
A) April 1
B) April 22
C) March 21
D) June 5
Answer: B) April 22
Q2. Which gas do plants absorb from the air during photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Answer: C) Carbon dioxide
Q3. What is the largest ocean on Earth?
A) Atlantic Ocean
B) Indian Ocean
C) Arctic Ocean
D) Pacific Ocean
Answer: D) Pacific Ocean
Q4. What does the 3 Rs in sustainability stand for?
A) Repair, Replace, Restock
B) Reduce, Reuse, Recycle
C) Rethink, Rebuild, Restore
D) Remove, Renew, Return
Answer: B) Reduce, Reuse, Recycle
Q5. What is the main source of energy for life on Earth?
A) The Moon
B) Wind
C) The Sun
D) Water
Answer: C) The Sun
Q6. What does WWF stand for?
A) World Water Foundation
B) Wild Wildlife Federation
C) World Wildlife Fund
D) World Welfare Forum
Answer: C) World Wildlife Fund
Q7. What gas do humans breathe in to survive?
A) Carbon dioxide
B) Nitrogen
C) Hydrogen
D) Oxygen
Answer: D) Oxygen
Q8. What do you call an animal that only eats plants?
A) Carnivore
B) Omnivore
C) Herbivore
D) Scavenger
Answer: C) Herbivore
Q9. Which color is most associated with environmental movements?
A) Blue
B) Red
C) Green
D) Yellow
Answer: C) Green
Q10. What is the most recycled material in the world?
A) Plastic
B) Glass
C) Paper
D) Steel
Answer: D) Steel
Q11. What is the main cause of ocean acidification?
A) Oil spills
B) Plastic waste
C) Absorption of excess CO₂
D) Nuclear waste
Answer: C) Absorption of excess CO₂
Q12. Which country produces the most solar energy in the world?
A) USA
B) Germany
C) India
D) China
Answer: D) China
Q13. What do coral reefs provide for ocean life?
A) Fresh drinking water
B) Habitat, food, and protection
C) Oxygen for humans
D) Shelter from tsunamis
Answer: B) Habitat, food, and protection
Q14. What is the leading renewable energy source used worldwide?
A) Solar energy
B) Wind energy
C) Hydropower
D) Geothermal energy
Answer: C) Hydropower
Q15. What is biodiversity?
A) The study of birds only
B) The variety of life in a habitat or on Earth
C) The process of growing crops
D) A type of renewable energy
Answer: B) The variety of life in a habitat or on Earth
Q16. Which gas has the highest global warming potential over 100 years?
A) Carbon dioxide
B) Methane
C) Nitrous oxide
D) Sulfur hexafluoride
Answer: D) Sulfur hexafluoride
Q17. What is the main threat to the Amazon rainforest?
A) Flooding
B) Volcanic activity
C) Deforestation driven by agriculture
D) Extreme cold
Answer: C) Deforestation driven by agriculture
Q18. What type of energy comes from the heat inside the Earth?
A) Solar energy
B) Wind energy
C) Tidal energy
D) Geothermal energy
Answer: D) Geothermal energy
Q19. Which sea creature is most affected by plastic pollution?
A) Sharks
B) Sea turtles
C) Dolphins
D) Starfish
Answer: B) Sea turtles
Q20. What is the role of bees in the ecosystem?
A) Decomposition
B) Pollination
C) Producing oxygen
D) Cleaning water
Answer: B) Pollination
Q21. What is the greenhouse effect?
A) Growing plants in a glass house
B) Cooling of Earth’s surface at night
C) Trapping of the Sun’s warmth by atmospheric gases
D) Reflection of sunlight by ice caps
Answer: C) Trapping of the Sun’s warmth by atmospheric gases
Q22. What does “carbon footprint” mean?
A) Weight of carbon in coal
B) Total greenhouse gases released by a person or activity
C) Shape of a carbon molecule
D) Carbon found in footwear manufacturing
Answer: B) Total greenhouse gases released by a person or activity
Q23. What is the ozone layer?
A) Oxygen at ground level
B) A region that absorbs UV radiation
C) A cloud layer of ozone gas
D) A thick layer of CO₂
Answer: B) A region that absorbs UV radiation
Q24. What is composting?
A) Burning organic waste
B) Turning food and garden waste into natural fertilizer
C) Sorting plastic from paper
D) Burying toxic chemicals
Answer: B) Turning food and garden waste into natural fertilizer
Q25. What are mangroves?
A) Deep-sea coral formations
B) Coastal trees that protect shorelines and store carbon
C) Mountain plants
D) Desert shrubs
Answer: B) Coastal trees that protect shorelines and store carbon
Q26. What does “net zero emissions” mean?
A) Using no electricity
B) Using only solar power
C) Balancing emissions released with emissions removed
D) Removing all factories
Answer: C) Balancing emissions released with emissions removed
Q27. What is light pollution?
A) UV rays from the Sun
B) Excessive artificial light that disrupts ecosystems
C) Light reflected by oceans
D) Pollution from solar panels
Answer: B) Excessive artificial light that disrupts ecosystems
Q28. What is the main source of methane emissions from agriculture?
A) Crop irrigation
B) Pesticide spraying
C) Livestock, especially cattle
D) Soil fertilization
Answer: C) Livestock, especially cattle
Q29. What is bioremediation?
A) Growing crops with rainwater
B) Using living organisms to clean polluted environments
C) Removing chemicals from water
D) Filtering air pollution
Answer: B) Using living organisms to clean polluted environments
Q30. What is the Great Pacific Garbage Patch?
A) Recycling center
B) Floating plastic waste area
C) Volcanic island
D) Oil spill zone
Answer: B) Floating plastic waste area
Q31. What is rewilding?
A) Training animals
B) Restoring land by reintroducing native species
C) Building wildlife zoos
D) Planting exotic trees
Answer: B) Restoring land by reintroducing native species
Q32. What is blue carbon?
A) Carbon in air
B) Carbon from coal
C) Carbon stored in ocean/coastal ecosystems
D) Carbon in mountains
Answer: C) Carbon stored in ocean/coastal ecosystems
Q33. What is eutrophication?
A) Freezing lakes
B) Excess nutrients cause algae overgrowth
C) Natural river cleaning
D) Ocean evaporating
Answer: B) Excess nutrients cause algae overgrowth
Q34. What does “sustainable living” mean?
A) No electricity
B) Rural living only
C) Meeting needs without harming future generations
D) Using only recycled products
Answer: C) Meeting needs without harming future generations
Q35. What is the IPCC?
A) Plastic Control Committee
B) Intergovernmental Panel on Climate Change
C) Program for Carbon Capture
D) Panel for Climate Conservation
Answer: B) Intergovernmental Panel on Climate Change
Q36. What is permafrost?
A) Antarctic ice
B) Permanently frozen ground
C) Frozen equatorial water
D) Frozen volcanic rock
Answer: B) Permanently frozen ground
Q37. What is a carbon sink?
A) Drain removing carbon
B) Natural system absorbing more carbon than it releases
C) Factory converting CO₂
D) Pollution measuring device
Answer: B) Natural system absorbing more carbon than it releases
Q38. What is the role of phytoplankton in the carbon cycle?
A) Filter plastic
B) Absorb CO₂ and produce oxygen
C) Break down oil
D) Store carbon on ocean floors
Answer: B) Absorb CO₂ and produce oxygen
Q39. What does “zero waste” mean?
A) No packaging use
B) Producing no trash for landfills/incinerators
C) Never buy new products
D) Composting food waste
Answer: B) Producing no trash for landfills/incinerators
Q40. What is an ecosystem?
A) Scientific animal lab
B) Government resource system
C) Community of living organisms interacting with environment
D) UN forest zone
Answer: C) Community of living organisms interacting with environment
Type-the-Answer Questions
Q41. What process do green plants use to make their own food using sunlight?
Answer: Photosynthesis
Q42. What do we call an animal that is at risk of disappearing forever?
Answer: Endangered species
Q43. What is the term for cutting down large areas of forest?
Answer: Deforestation
Q44. What is rainwater that has become acidic due to pollution called?
Answer: Acid rain
Q45. What do we call the process of turning food and garden waste into natural fertilizer?
Answer: Composting
Q46. What is the name of the large floating plastic waste area in the North Pacific Ocean?
Answer: Great Pacific Garbage Patch
Q47. What is the term for restoring land to its natural state by reintroducing native species?
Answer: Rewilding
Q48. What is the name of the carbon stored in coastal ecosystems like mangroves and seagrasses?
Answer: Blue carbon
Q49. What international agreement committed countries to reducing greenhouse gas emissions in 1997?
Answer: Kyoto Protocol
Q50. What is the term for using living organisms to clean up polluted environments?
Answer: Bioremediation
Q51. What natural process breaks down dead organisms and returns nutrients to the soil?
Answer: Decomposition
Q52. What is the name of the international agreement on biodiversity signed in 1992?
Answer: Convention on Biological Diversity
Q53. What is the term for the total carbon emissions from producing and installing building materials?
Answer: Embodied carbon
Q54. What is the idea called where shared resources get destroyed because everyone uses them for personal gain?
Answer: Tragedy of the commons
Q55. What is the term for large-scale human intervention in Earth’s systems to counteract climate change?
Answer: Geoengineering
Q56. What is the name given to the nine Earth system processes that define a safe space for human life?
Answer: Planetary boundaries
Q57. What is the process where excess nutrients in water cause algae to overgrow and deplete oxygen?
Answer: Eutrophication
Q58. What is the term for the point where a small climate change triggers a large, irreversible shift?
Answer: Tipping point
Q59. What do we call the measure of how much sunlight a surface reflects?
Answer: Albedo
Q60. What is the gas most responsible for the greenhouse effect caused by human activity?
Answer: Carbon dioxide (CO₂)
Q61. What type of energy is generated from the heat deep inside the Earth?
Answer: Geothermal energy
Q62. What are the tiny ocean organisms that produce about half of Earth’s oxygen?
Answer: Phytoplankton
Q63. What is the term for permanently frozen ground found in polar regions?
Answer: Permafrost
Q64. What is the name of the process that evaluates the environmental effects of a project before it begins?
Answer: Environmental impact assessment
Q65. What do we call excessive artificial light that disrupts wildlife and ecosystems?
Answer: Light pollution
If you’re also planning environmental activities, you can explore our Earth Hour quiz questions and Earth Hour environmental facts to extend the learning experience even further.
Number-Based Questions
Q66. In what year was the first Earth Day celebrated?
Answer: 1970
Q67. What percentage of Earth’s surface is covered by water?
Answer: 71
Q68. How many years does a plastic bottle take to fully decompose?
Answer: 450
Q69. How many countries celebrate Earth Day every year?
Answer: 193
Q70. What percentage of Earth’s freshwater is accessible for human use?
Answer: 1
Q71. In what year was the Paris Agreement signed?
Answer: 2015
Q72. Approximately what percentage of Earth’s species are insects?
Answer: 80
Q73. How many continents are there on Earth?
Answer: 7
Q74. In what year was the Kyoto Protocol adopted?
Answer: 1997
Q75. What is the current concentration of CO₂ in Earth’s atmosphere in parts per million?
Answer: 420
Q76. In what year was the Convention on Biological Diversity signed?
Answer: 1992
Q77. How many years does an aluminum can take to decompose?
Answer: 80
Q78. What percentage of the ocean floor do coral reefs cover?
Answer: 1
Q79. How many people celebrate Earth Day around the world each year (in billions)?
Answer: 1
Q80. How many major ocean gyres are there on Earth?
Answer: 5
Q81. In what year was the Kunming-Montreal Biodiversity Agreement signed?
Answer: 2022
Q82. What percentage of oxygen is produced by phytoplankton in the ocean?
Answer: 50
Q83. How many weeks does a newspaper take to decompose?
Answer: 6
Q84. How many planetary boundaries define a safe operating space for humanity?
Answer: 9
Q85. What percentage of the Amazon rainforest has been lost to deforestation so far?
Answer: 20
Arrange-in-Order Questions
Q86. Arrange these materials from longest to shortest decomposition time.
Plastic bottle — 450 years
Aluminum can — 80 years
Apple core — 2 months
Newspaper — 6 weeks
Correct order: Plastic bottle → Aluminum can → Apple core → Newspaper
Q87. Put these renewable energy sources in order from most to least used worldwide.
Hydropower
Wind energy
Solar energy
Geothermal energy
Correct order: Hydropower → Wind → Solar → Geothermal
Q88. Arrange these greenhouse gases from highest to lowest global warming potential.
Sulfur hexafluoride (SF₆)
Methane
Nitrous oxide
Carbon dioxide
Correct order: SF₆ → Methane → Nitrous oxide → CO₂
Q89. Put these Earth layers in order from outermost to innermost.
Crust
Mantle
Outer core
Inner core
Correct order: Crust → Mantle → Outer core → Inner core
Q90. Arrange these environmental agreements from oldest to most recent.
Convention on Biological Diversity — 1992
Kyoto Protocol — 1997
Paris Agreement — 2015
Kunming-Montreal Agreement — 2022
Correct order: CBD → Kyoto → Paris → Kunming-Montreal
Q91. Put these ocean zones in order from shallowest to deepest.
Sunlight zone (Epipelagic)
Twilight zone (Mesopelagic)
Midnight zone (Bathypelagic)
Abyssal zone
Correct order: Sunlight → Twilight → Midnight → Abyssal
Q92. Arrange these actions from most to least impactful for reducing personal carbon footprint.
Avoid flying
Go car-free
Eat a plant-based diet
Switch to LED bulbs
Correct order: Avoid flying → Car-free → Plant-based diet → LED bulbs
Q93. Put these ecosystems in order from most to least carbon stored per hectare.
Mangroves
Tropical rainforests
Temperate forests
Grasslands
Correct order: Mangroves → Tropical rainforests → Temperate forests → Grasslands
Q94. Arrange these events in the history of environmentalism from earliest to latest.
First Earth Day — 1970
Kyoto Protocol — 1997
Paris Agreement — 2015
Kunming-Montreal Agreement — 2022
Correct order: Earth Day → Kyoto → Paris → Kunming-Montreal
Q95. Put these waste items in order from most to least recyclable globally.
Steel
Glass
Paper
Plastic
Correct order: Steel → Glass → Paper → Plastic
Q96. Arrange these energy sources from cleanest to most polluting.
Solar energy
Wind energy
Natural gas
Coal
Correct order: Solar → Wind → Natural gas → Coal
Q97. Put these animals in order from most to least endangered globally.
Amur leopard
Sumatran orangutan
African elephant
Polar bear
Correct order: Amur leopard → Sumatran orangutan → African elephant → Polar bear
Q98. Arrange these human activities from highest to lowest contribution to global CO₂ emissions.
Energy production
Transportation
Agriculture
Waste management
Correct order: Energy production → Transportation → Agriculture → Waste management
Q99. Put these oceans in order from largest to smallest.
Pacific Ocean
Atlantic Ocean
Indian Ocean
Arctic Ocean
Correct order: Pacific → Atlantic → Indian → Arctic
Q100. Arrange these steps of composting in the correct order from start to finish.
Collect food and garden waste
Layer green and brown materials
Turn and aerate the pile regularly
Use finished compost in the garden
Correct order: Collect → Layer → Turn and aerate → Use in garden
How Slidea Makes Your Earth Day Quiz Come Alive
Reading quiz questions out loud is fine. But running them live on a screen, where every participant answers in real time and results appear instantly, is a completely different experience. That’s what Slidea’s interactive quiz maker is built to do. It has four quiz slide types that work perfectly for an Earth Day quiz:
Select Answer:
Show a question with four answer choices on screen. Everyone picks their answer from their phone at the same time. Results reveal instantly and the room reacts together. Perfect for the question rounds where participants choose from options.
Type Answer:
Instead of picking from a list, participants type their answer directly into their phone. Great for Fill in the Blank like questions. It adds a real challenge because there are no hints, just the question and an answer. It also works well for open science questions where you want participants to think freely.
Pick the Number:
Show a number-based question on screen and let participants slide their numeric guess. Perfect for questions like “In what year was Earth Day first celebrated?” or “What percentage of Earth’s surface is covered by water?” It adds a fun guessing element that keeps everyone leaning forward.
Lineup:
Give participants a set of items and ask them to arrange in the correct order. For Earth Day, this works great for questions like “Rank these materials from fastest to slowest to decompose” or “Put these renewable energy sources in order from most to least used worldwide.” It makes participants think beyond just picking an answer and creates great discussion after the reveal.
Participants join Slidea by scanning a QR code or enter the number code or click the session link from any phone or laptop, no app download needed. It works for in-person classrooms, virtual meetings, and hybrid events equally well. Every answer is collected in real time, scores update automatically, and the leaderboard builds excitement from the first question to the last.
Final Thoughts
Creating awareness about our planet becomes far more impactful when people actively participate instead of simply reading facts. Interactive quizzes turn environmental concepts into experiences, students and audiences tap answers, react to live results, and feel involved in the learning moment.
With an interactive quiz builder, your Earth Day questions transform into conversations that spark curiosity and inspire action. When participants see how their knowledge connects to real-world issues like conservation, biodiversity, and climate change, the message stays with them long after the quiz ends.
So next time you plan Earth Day activities, turn your question set into a dynamic quiz session. A little interactivity goes a long way in helping people understand, remember, and care about our planet’s future.
FAQs
Q1. What are Earth Day quiz questions used for?
Earth Day quiz questions are used to educate students, teams, and communities about environmental science, sustainability, climate change, and nature in a fun and engaging way.
Q2. Are Earth Day quizzes suitable for all ages?
Yes. Easy questions work well for younger learners, while more complex ones can challenge teens and adults.
Q3. What topics should an Earth Day quiz cover?
Popular themes include recycling, ecosystems, biodiversity, renewable energy, carbon footprint, and global environmental issues.
Q4. How can I make an Earth Day quiz more engaging?
Use an interactive quiz builder to collect live responses, show instant feedback, and make learning feel more dynamic and participatory.
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