What is most likely true of an atom with a mass of 15 amu?

What is the question?

Large asteroid and comet impacts. because they can have a huge impact on the environment, such as a loss of land, and crust on the earth with the big holes they produce. on the other hand, volcanic eruptions can also cause change within the environment by producing land, but im actually not quite sure which one would be a better answer, hopefully you read this and didnt just flat out choose the first sentence i have spoken! your welcome~

What is your question i dont understand well sorry 

  homes and businesses. of the four major uses of water, which is predicted to demand more than 300 million kiloliters of water in hogan county alone in 2020? industries that reduce water use, recycle water, and reuse water are practicing