Which one of the following criterion is most suitable for determining the internal constitution of the earth?

Volcanic emanations are directly the melt coming out from deep Earth so it's composition gives the direct evidence of , layers. if felsic then from crystal depth, If mafic from ma...

Reflected seismic waves are used to determine the internal constituents of the Earth. Variation in speed and direction of seismic waves can be related to physical and chemical prop...