Explain how the ice core record provides “a natural timeline of climate history”? this is for science

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   

The total number of nucleons

Answer trigonal pyramidal;

For a collision to be successful you need 2 different objects