| A | B |
|---|
| Earth | 3rd planet from the sun with a diamter of 12,756 km. 3 Main layers. |
| Layers | 3 Main: Crust, Mantle and Core |
| Crust | Surface Layer with a varying thickness of 5-75 km. Made of rock and minerals Si, O, Al, Ca, Na, and K |
| Mantle | 2nd and thickest Layer of the earth. About 2800 km thick. Mostly solid made of Si, and O. |
| Outer Core | 3rd layer of earth. Is Liquid, and is made of Iron (Fe) and Nickel (Ni) |
| Inner Core | This layer is solid and made of Iron (Fe) and Nickel (Ni) |
| Magnetosphere | Protective magnetic field that is produced by the cores of earth. It protects us from harmful radiation of the sun. |
| Lithosphere | This Layer consists of Crust plus upper Mantle. Is about 100 km thick. Think of this layer as the plates of earth. |
| Asthenosphere | Jelly-like, Plasticy Upper Mantle layer, soft that the Lithosphere rides on top of- 250 km thick. |
| Inge Lehmann | In 1936 she discovered that there's more than 1 core - The inner is solid. |
| Richard Oldham | In 1906 he discovered that the earth has a (Liquid) core |
| Oceanic Crust | Thinner, but more dense than Continental Crust and the rock is a darker rock called Basalt |
| Continental Crust | Thickness varies under mountains to a depth of 75km/48 mi. |
| Seismic waves | Waves created naturally by earthquakes. They have given geologists a clearer understanding of the inner layers and composition of earth. |
| Density | How compact or dense the layers are of earth. They vary from 2.8 g/cm3 in the crust to 12 g/cm3 in the inner core. The Average is 5.54g/cm3 |
| Basalt | Rock type formed under ocean crust |
| Granite | Continental rock formed in the earth's crust |
| Temperature | Each layer of the earth gets hotter the deeper you go. The inner core is 11-13,000 F, or 5-6,000 C about 3,000 K |
| Pressure | Pressure Also increases with depth because of the weight of the rock above it. |
| Thickness | Thickest layer is the Mantle, thinnest is the Crust |
