If 30 wave crests pass by you in 10 seconds, what is the wave's frequency?

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

What is the subscript for oxygen in its molecular formula

What is the source of continuous heat and energy that we receive from the sun