True or false: u find soil rich in humus in horizon c

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

How might this scientific phenomena be explained? a paper clip floats on water.

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?