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Edexcel new p4
waves and the earth
| Question | Answer |
|---|---|
| Convection current | A current caused by either a liquid or gas being heated and hotter less dense parts rise and denser cooler sections sink |
| core | the middle of the earth |
| crust | the outer section of the earth |
| Earthquake | A sudden movement within the earth releasing a large amount of energy |
| epicentre | the point on the earths centre directly above the focus of an earthquake |
| infrasound | sound with a frequency of less than 20Hz which is too low for humans to hear |
| mantle | The part of the earth between the crust and the core. It is semi solid. |
| P- Primary waves | Longitudinal waves that can travel through all layers of the earth |
| S- Secondary waves | Transverse waves that travel through the earth. They cannot travel through the liquid core. |
| Seismic waves | Waves produced by an explosion or earthquake that travel through the earth. These include P and S waves. |
| Sonar | A way of finding the distance to an underwater object or sea floor but iming how long it takes for a pulse of ultrasound to return after reflecting. |
| Tectonic plate | Pieces of the earth surface that move around slowly due to the convection current in the earth's mantle. |
| Tsunami | A very large wave caused by an earthquake or landslide |
| ultrasound | sound with a frequency of more than 20KHz which is too high for humans to hear |
| ultrasound scan | A way of making an image of part of the body using ultrasound reflected from parts of the body inside. |
Created by:
Susan E Casey
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