16 Density, Pressure, and Temperature Moving towards the center of the earth:Density increasesPressure increasesTemperature increases
17 How do we know there are layers of the earth? Earthquakes emit different kinds of seismic waves that can travel through different substances and at different speedsScientists used these waves to determine the layers based on the speed and movement of the layers!
18 The MOHOThe Moho is the boundary where the crust meets the mantleIt was discovered in 1909 by Andrija MohorovicicIt was discovered because at this point density changes and seismic waves change direction
21 Why does Earth have a magnetic field? Earth’s magnetic field is a result of the movement of iron in the Earth’s liquid inner core.
22 In Review:What are the 3 main layers of the Earth?Crust, Mantle, CoreWhich layer is the least dense?CrustWhich core layer is solid iron and nickel?Inner coreWhat is the name given to the “crunchy” layer of the crust and uppermost part of the mantle?Lithosphere5. The motion in this layer is the reason Earth has a magnetic field.Outer core
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