When an earthquake occurs s waves are the first seismic waves to arrive at a given location

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Explanation: S-waves are the secondary waves that can travel only through solid whereas P-waves are the primary waves that can travel both in solid as well as liquid. P-waves travels faster than S-waves.

When there occurs an earthquake, P-waves arrives at the given location first, and S waves occurs a little later than that, it is because during the time of an earthquake, the waves travels in the interior of the earth and after striking the mantle or core boundary, it gets reflected back. The time it takes for S wave to reach the given location is about the double of time it takes by P waves.

its been noted for the past decade or so that there is some (approximately 5% to 7%) shrinkage in the brains of people who have schizophrenia, most notably in the gray matter, which is an important part structures in the brain’s amygdala, hippocampus and parahippocampus, which are all involved in memory storage and retrieval memory storage and retrieval.

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the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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