Earth

2. The particle that Earth originally was
3. The centre of the Earth creates a _______ field that keeps intergalactic rays from travelling into our atmosphere
4. Earth is the only planet to have _______ plates
6. Earth is around four point ____ billion years old
8. The name astronomers gave to Earth's moon
10. The shape of Earth is considered to be an oblate spheroid or an _______
11. Earth is the _____ planet from the sun
12. Earth's core is mainly made out of ______ and iron
13. The atmosphere is mostly made out of nitrogen, oxygen, carbon dioxide and _____

1. Earth's most special feature
3. Troposphere, stratosphere, _________, thermosphere, exosphere
4. Earth's latin name
5. Water escaped the cracks in the _____ to form water vapour
7. That layer of the atmosphere that ascends into space
9. The nitrogen and oxygen in the thermosphere absorb _______ and change it to heat