Week 3 Tectonic Plates
Task 1 - Review of Week 2
Model of earth
Discontinuities and evidence from earthquakes
1. Review the Mohorovicic Discontinuity
2. Earthquakes as evidence for discontinuities in the earth
Use text p336 to 337
First READ the information
Write the subheading
On the left of your page write the key words and on the right of your page write notes and diagrams.
2. Earthquakes as evidence for discontinuities in the earth
Use text p336 to 337
First READ the information
Write the subheading
On the left of your page write the key words and on the right of your page write notes and diagrams.
Seismograms - the printout from the seismometer
Seismic waves and the relationship to earth discontinuities
Use text p339
First READ the information
Write the subheading
On the left of your page write the key words and on the right of your page write notes and
diagrams.
Evidence for plate tectonicsComplete the Text page 321 question 17 on A3 paper as a summary of evidence for plate movement.
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Earth Structure and Plate MovementThis video covers;
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A Theory for the Mechanism of Plate Movement
Review convection currents.
Heating of a fixed mass of material causes an increase in volume. If the volume increases then how must density respond to keep the mass constant? We may write this as a mathematical expression; mass = density x volume |
Less dense materials rise over more dense materials.
As the fixed mass of material cools its volume decreases.
A decrease in volume results in an increase in density so the material sinks.
density = mass / volume
As the fixed mass of material cools its volume decreases.
A decrease in volume results in an increase in density so the material sinks.
density = mass / volume