Prior to its discovery on earth helium's existence was first confirmed in the sun how is this possible

This is possible because Pierre-Jules-CĂ©sar Janssen, A french Astronomer, Discovered a thin yellow line while studying a total solar eclipse. The spectral lines in this thin yellow line was the same as excited helium molecules.

Answerair masses develop near the equator are warm; tropical air mass

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.