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Astronomy - Section 1

Topic 1 - The Earth

Crust:

- 770K-1170K

- 5-90km

- Solid, largely silicate rocks

Mantle:

- 1170K-4300K

- 3000km

- Semi Molten (Upper), Solid (Lower), Magnesium Silicate

Outer Core:

- 4300K-5000K

-5000km

- liquid, iron & iron sulphide

Inner Core:

- 5000K-5500K

- 6500km

- Solid, iron - nickel alloy

- Earth is Oblate Spheroid

- (-273) Celcius = 0K

Topic 2 - Latitude & Longitude

- Prime Meridian = 0˚ Longitude

- Equator = 0˚ Latitude

- Further West you go, the longer you have to wait to see the sun