Reese put gravel, sand, and clay in a bottle. she added some water, shook the bottle, and left it for an hour. what did she see after an hour?

Gravel settled at the bottom and clay settled at the top.

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