Most inferences about the characteristics of Earth's mantle and core are based on
o comparisons between Moon rocks and Earth rocks
o chemical changes in expored and weathered
metamorphic rock
o the behavior of seismic waves in Earth's interior
o well drillings from Earth's mantle and core

B.) falsehope this !

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf