Which two spheres are interacting when snow is falling on the mountains? A. Atmosphere and Biosphere
B. Atmosphere and Cryosphere
C. Cryosphere and Geosphere
D. Biosphere and Geosphere

Supongamos que estás estudiando dos estrellas. ambas estrellas tienen la misma magnitud aparente, pero la estrella a tiene una magnitud absoluta mayor que la estrella b. ¿que puedes decir acerca de la distancia a la tierra de estas dos estrellas?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules