Answer: Test the hypothesis multiple times
Explanation:
The correct answer is letter C. Mass Movement and runoff. The sediments are washed or fall into the river because of the mass movement of the water and the runoff that will surely bring the sediments down.
Domestic fuel sources are preferable to international fuel sources because domestic fuels are always cheaper to acquire and renewable. The correct option in regards to this question is the third option given. The fuel that the country imports will definitely cost higher and there is no doubt about it. The fuels that are present can be replenished very easily without having to wait for the imported fuel to come in. The imported fuel rate will also vary and sometimes may become too highly priced. So depending on national or domestic fuel sources is always a better option compared to looking out for international sources.
Because the evaporation is like a filter it leaves most things behind like bacteria or salt then when it comes down from the sky (or rain :P) it is safe to drink (NEVER DRINK WATER THAT IS DRIPPING OFF A ROOF!!!). but if air pollution gets into the cloud it could contaminate the vapor and turn it into acid rain which can do lots of damage.