SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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P-waves arrive earlier than S-waves.
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P-waves and S-waves are both recorded at allstations.
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Only S-waves are recorded at all stations.
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Only P-waves are recorded on the oppositeside of Earth.
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Detailed explanation-1: -P-waves and S-waves are both recorded at all stations.
Detailed explanation-2: -When P-waves strike the outer core, however, they bend downward when traveling through the outer core and bend again when they leave. This indicates that P-waves slow down in the outer core, suggesting that this layer has a significantly different composition from the mantle and may actually be liquid.
Detailed explanation-3: -Blocked seismic waves create a seismic shadow zone on the opposite side of the Earth. Scientists have used this knowledge about blocked seismic waves to determine that the Earth’s core is liquid. This is because some types of seismic waves can only travel through solid materials.
Detailed explanation-4: -P-wave:the primary body wave; the first seismic wave detected by seismographs; able to move through both liquid and solid rock. S Wave-secondary body waves that oscillate the ground perpendicular to the direction of wave travel.