The correct answer is - C. The river carried enormous amounts of silt.
The Yellow River, got this nickname because it is yellowish from the enormous amounts of silt it carries. When there were heavy rains, or the snow was melting, the river got more water, but also more silt, so the silt was partially blocking the free movement of all of the water, so it was flooding the surrounding are. In one way, the floods were terrible because they were destroying pretty much everything on their way, but on the other side, were living huge amounts of deposits that were fertilizing the soil for the agriculture.
D. a new substance is formed. if it is chemical change then it is actually changing to something new. In this case a new substance is formed. It is a completely different substance from what you started out with.
This is a type of precipitation that comes from fronts encasing tropical cyclones, which forms when warm air meets cold air.
All of them Plays an equal and important role to support life on Earth..
C. Nuclear to be honest, I don’t know, but I think this is the answer.