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Edexcel new p4

waves and the earth

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