Explain why earth and other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago (mya). what was this particular time period called, and why is this time period not really considered a part of earth’s geological history?

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.