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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