This quiz works best with JavaScript enabled. Home > Science > Earth > Environmental Sciences – Quiz 687 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Environmental Sciences Quiz 687 (5 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How many species of living things are estimated to live on the planet? A) 1-2 million. B) 1-2 billion. C) 100, 000. D) 10-100 million. Show Answer Correct Answer: D) 10-100 million. 2. The flowers are red. A) Qualitative data. B) Quantitative data. Show Answer Correct Answer: A) Qualitative data. 3. What is the outermost layer of the atmosphere called? (Furthest away from us?) A) Stratosphere. B) Troposphere. C) Exosphere. D) Ionosphere. Show Answer Correct Answer: C) Exosphere. 4. Pangaea was an ancient supercontinent made up of ..... A) America, Greenland, and Europe. B) Antarctica, India, and America. C) All of Earth's continents. D) South Africa, India, Australia, and South America. Show Answer Correct Answer: C) All of Earth's continents. 5. After living organisms use nitrogen, decomposer bacteria convert it back to ammonia for plants to use through this process A) Nitrogen fixation. B) Ammonification. C) Nitrification. D) Denitrification. Show Answer Correct Answer: B) Ammonification. ← PreviousRelated QuizzesScience QuizzesEnvironmental Sciences Quiz 1Environmental Sciences Quiz 2Environmental Sciences Quiz 3Environmental Sciences Quiz 4Environmental Sciences Quiz 5Environmental Sciences Quiz 6Environmental Sciences Quiz 7Environmental Sciences Quiz 8Environmental Sciences Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books