Unit 2 Lesson 1

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Unit 2, Lesson 1: 

Unit 2, Lesson 1 The Earth’s Core

Earthquakes and Seismic Waves: 

Earthquakes and Seismic Waves An earthquake is a sudden movement of Earth’s outermost layers. Shock waves produced by an earthquake are called seismic waves.

Seismograph: 

Seismograph Seismic waves are detected and recorded by an instrument called a seismograph.

P & S Waves: 

P & S Waves Seismic waves called P waves and S waves are used to study the structure and composition of the Earth’s interior.

How do scientists use this stuff? : 

How do scientists use this stuff? P waves move more slowly through liquids. S waves do not move through liquids at all. This information has helped scientists determine that the outer core is liquid and the inner core is solid.

Inner and Outer Core: 

Inner and Outer Core The core of the Earth is made of a liquid outer core and a solid inner core. Both core layers are composed of iron and nickel.

Core Temperatures: 

Core Temperatures Although the temperature is high enough to melt iron and nickel, the inner core is solid because of the enormous pressure. The temperature range of the outer core is between 2200oC to 5000oC

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