Which is more dense hot magma or cool magma?

Idon’t know how to solve this question

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added