We know what is in the center of the earth because scientists have dug a tunnel to it.

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

The tansition zone is a layer between the lower mantle and the upper mantle.

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

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

The central part of the earth is called the core

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

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

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

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

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