Many sulfides are important sources of metals. For example, we obtain lead from the mineral galena (lead sulfide) and silver
from the mineral argentite (silver sulfide). These minerals often form in a similar way, when dissolved metals react with sulfide ions in hot water
flowing through rocks.
Why do you think it's useful to group these reactions together as a single type?

Which of these best describes the scientific process

Which characteristics can be used to differentiate star systems? check all that apply.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?