What is a single region of air that has both a rising and falling air current due to temperature differences?

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

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged