Answer:
1)area of the earth from angular distance of 104to 140 degress from a given earthquake that does not receive any direct p waves.
2)the s wave shadow zone os the area of the earth's surface where s waves are not detected following an earthquake.
Explanation:
hope that can help
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Streak i think you may want to wait for a better answer.
Nuclear fusion because the sun has massive gravity that squeeze hydrogen atoms together and fusing them into helium which releases energy
Uneven distribution of wealth, increased population leads to crowded urban areas which could be unsanitary, immigration can cause cultural conflicts