Mark all the things that can impact the density of salt water

A.
Salinity

B.
Depth

C.
Time

D.
Temperature

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural. question 2 reflects a moral or social value. question 3 refers to something that can be measured. question 4 reflects a question that can’t be observed.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Can someone me with 3 and 4 plz. this is for masteries test.