Earthy Terms

2. The Earth has a large satellite known as the ________
5. numerous asteroid impacts during the Late Heavy ________.
8. The most abundant chemical compound found in the Earth’s crust.
9. 71% of the surface is covered in this
10. the only planet known to have this
12. the ‘sphere’ of the Earth that involves the robust movement and circulation of water on the Earth and that water commonly exists in 3 different phases.

1. The Earth hasn’t always looked like it does today. About a 1000-541Mya the Earth may have been completely covered in ice – known as “ _________ Earth”
3. Nebular theory suggests that _________ formed about 4.5bya by accretion.
4. a unique thing about the Earth is that it has a vibrant geological process whereby new continental crust is formed by the process of plate _______.
6. The main part of Earth's magnetic field is generated in the core, the site of a _________ process that converts the kinetic energy of thermally and compositionally driven convection into electrical and magnetic field energy
7. an adjective form of Earth similar to Earthling – often used in science fiction
11. dating the age of the Earth is done in large part by the presence of grains of the mineral _____ which formed during the Hadean age.