Chapter 4, Structure of the Earth

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Boron is found in all the layers of the mantle and contributes to the magnetic field of the earth.

The central part of the earth is called the core

P waves occur on the Pacific Ocean, and S waves occur on the beaches of the Atlantic Ocean. Both help predict weather patterns.

S waves are the second fastest seismic waves and travel only through solids

Electric currents formed from the molten iron in the outer core is believed to create the earth's magnetic field

P waves are the fastest seismic waves, they travel through solids, liquids and gases.

The crust is divided into two parts, country and ocean.

The moho is a type of rock found in the outer core of the earth.