Consider the statements regarding Earth rsquo s interior and seismic waves 1 Primary waves totally d...........

Geography Earth Geology

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Consider the statements regarding Earth’s interior and seismic waves.

1) Primary waves totally disappear in the core region revealing that outer core is made

up of liquid.

2) Secondary waves show changes in its speed as it travels from magma chamber to

lithosphere region indicating difference in density.

3) The speed of secondary waves is highest inside the Earth’s Core region indicating

highest density in the Core region.

Choose the correct statement/s from the code below.

1&2 only

2 only

1&3 only

2&3 only

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Explanation:

Primary waves (P-waves) are compressional waves that are longitudinal in nature. These
waves can travel through any type of material, including fluids, and can travel at nearly
twice the speed of S waves. Thus will not disappear in the core. But S waves do disappear in
the core region.
Secondary waves (S-waves) are shear waves that are transverse in nature. S-waves can
travel only through solids, as fluids (liquids and gases) do not support shear stresses. Swaves
are slower than P-waves, and speeds are typically around 60% of that of P-waves in
any given material. S waves speed varies with density just like P waves and this speed
increases with increasing density. Since there is density difference between lithosphere and
magma chamber the speed of the S waves do change.
S waves do not enter the Core region as the outer core is made up of liquid.