These form under water at most convergent boundaries? ? ? due in 20 minutes

Volcanoes and mountains are created

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

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