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what are s-waves
s-waves are slower than p-waves. They oscillate at 90`to direction of travel. They can also not travel through liquid.
What are P-waves
P-waves are faster and these oscillate(move back and forth) in the same direction as travel.
What is the structure of the earth
- Outer core-liquid
- Inner core-solid
How do we know the structure of the earth?
S-Waves can't travel through the outer core proving it's a liquid.
What are the two types of waves?
S-waves and p-waves. You can also have surface waves
What is refraction?
Refraction occurs when a wave travels between two different types of medium it changes direction due to a speed change.
What is total internal refraction?
When light enters a material past it's critical angle it totally internally reflects within it.
What is time lag and how is it used?
Difference between s and p waves. This can be used to find the epicentre of the earthquake.
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