5 Questions
Earth is the _______ closest planet to the Sun
third
Earth is the _______ largest planet in our solar system
fifth
Earth is the only planet that contains _______
life
Earth is _______ billion years old
4.543
Earth's surface is mainly _______
water
Test your knowledge on the essential concepts for sustaining life on Earth and the seven environmental principles of nature. Learn about the unique characteristics of our planet and the principles we should follow to preserve it.
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