What hotter earth or sun

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

What is the value of keq for the reaction expressed in scientific notation?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit