Seismic Waves Lesson Outcomes

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Presentation transcript:

Seismic Waves Lesson Outcomes Key Words:- P Waves, S Waves, Epicentre To be able to describe that earthquakes are cause by 2 types of waves: S and P waves and be able to describe the difference between S and P waves. To be able to explain how seismic waves enable us to know about structure of Earth. To revise all the main topics from P1.

Connector - How do we know anything about the structure of the Earth? Draw big diagram and Label up Different parts of the Earth? Estimate diameter of Earth What is the deepest man has been down into the Earth? How do we know anything about the Core of the Earth?

The Structure of the Earth A thin crust - 10-100km thick A mantle – has the properties of a solid but it can also flow A core – made of molten nickel and iron. Outer part is liquid and inner part is solid How do we know this? These facts have all been discovered by examining seismic waves (earthquakes)

Seismic waves P waves: S waves: Earthquakes travel as waves through the Earth – we call them SEISMIC WAVES. There are two types: P waves: They are longitudinal so they cause the ground to move up and down They can pass through solids and liquids They go faster through more dense material S waves: They are transverse so they cause the ground to move from right to left They ONLY pass through solids They are slower than P waves They go faster through more dense material

Seismograph Demo If you have a Smart Phone, this can be demonstrated. Otherwise click on the link above.

Seismic Waves Lesson Outcomes Key Words:- P Waves, S Waves, Epicentre To be able to describe that earthquakes are cause by 2 types of waves: S and P waves and be able to describe the difference between S and P waves. To be able to explain how seismic waves enable us to know about structure of Earth. To revise all the main topics from P1.

Seismic waves S waves will only travel through a solid P waves travel through the Earth and are refracted when they pass through a medium The paths of these waves are all curved because density is gradually changing These observations tell us 3 things about the Earth: 1) It has a thin crust, 2) it has a semi-fluid mantle where density increases with depth, 3) a core with a liquid outer part and a solid inner part.

Seismic Waves Lesson Outcomes Key Words:- P Waves, S Waves, Epicentre To be able to describe that earthquakes are cause by 2 types of waves: S and P waves and be able to describe the difference between S and P waves. To be able to explain how seismic waves enable us to know about structure of Earth. To revise all the main topics from P1.

P1 Revision In groups of 4 make a poster on one of the following topics:- Heat and Temperature Specific Heat Capacity and Latent Heat of Fusion Methods of Heat Transfer Insulation Methods and Payback Time Energy Efficiency and power Wave Properties Electromagnetic Spectrum and Uses Your teacher will assign you a topic

Seismic Waves Lesson Outcomes Key Words:- P Waves, S Waves, Epicentre To be able to describe that earthquakes are cause by 2 types of waves: S and P waves and be able to describe the difference between S and P waves. To be able to explain how seismic waves enable us to know about structure of Earth. To revise all the main topics from P1.