Science

The outer layer of the earth. thinnest layer Made up of both continental (land)and oceanic crust(under the ocean).

Largest layer of the Earth Composed of silicate rocks rich in magnesium and iron Intense heat causes the rocks to rise and then cool and sink. The process is called convection, which causes the crust to move. Average temperature 3000

Liquid layer 2,300 km thick, second largest. Composed of liquid iron and nickel. Lies between inner core and mantle. Because the magma moves around the inner core, Earth’s magnetic field is created. Average temperature 4000o -5000o

A solid ball of metal Made of solid nickel and iron Densest layer of the Earth Average temperature 5000-6000 Spins at a speed faster than the Earth rotates So hot it melts everything in the outer core

Seismic waves are used to determine which layers of the Earth are solid or liquid. Some seismic waves cannot pass through certain layers giving us a clue to the layer’s composition.