16. The Ecology Flag, which has become an official symbol of Earth Day, is patterned after the American flag and contains what three colors?
17. The idea for Earth Day came from Gaylord Nelson
18. Throughout its history, Earth Day has only been supported by Democrats
19. What do you call the variation of life forms within an ecosystem?
20. What is the percentage of oxygen in the Earths atmosphere?
21. What percentage of the Earths surface is covered in water?
22. What politician is considered the founder of Earth Day?
23. What was the purpose of the National Environmental Education Act passed by Congress in 1990?
24. Where is Earth located in our Solar System
25. Which is the fastest land animal?
26. Which is the highest waterfall in the world?
27. Which is the largest island?
28. Which is the largest ocean on our planet?
29. Which is the longest mountain range on the planet?
30. Which land-based ecosystem holds the most biodiversity, i.e. concentration of plants and animals?
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