Earth Guide: 8 Great Questions About Planet Earth

The Japan Science and Technology Agency has created the Earth Guide, which is a sophisticated website that provides extensive, easy-to-understand answers to the following 8 questions: 

1. Where is the Earth in the Milky Way Galaxy?
2. How is the Earth different from other planets?
3. Where does the sky become space?
4. Where does the sunlight that hits the Earth go?
5. How do water and carbon circulate?
6. What types of substances is the Earth made of?
7. What kind of land areas exist on the face of the Earth?
8. How big are the oceans of the world?

The site also offers keyword searchability. 

The Earth Guide is a fascinating site that I recommend.