xShadow zone : The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being b
Despite growing awareness of the problem of plastic pollution in the world's oceans, little solid scientific information has existed about the nature and scope of the issue. This week, a team of researchers...Read more