What kinds of scientific investigations do not involve experiments

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

What are the first three quantum numbers for the electrons located in subshell 2s?

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull