1. 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.

2. 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?

3. The Structure of the Earth
A thin crust km 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)

4. 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

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

6. 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.

7. 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.

9. 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.

10. 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

11. 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.