i don't know how you would really sum the two up. rock is a vast genre with many different sub genres. metal depends on a few factors too and has all it's own sub-genres too. to me it's the whole sound that makes it metal. that depends on era to. i've seen motley crue, poison, whitesnake, etc. classified as metal but i wouldn't consider it metal at all.
some of the things, in my opinion anyways, that make music metal is that a lot of the time metal bands will use a drop tuning to make it deeper, thicker, more eerie, loud type sound. a lot of bass double kicking on the drums is used as well. it more or less has a thicker, heavier sound than the majority of rock bands.
every one has a differing opinions on what's metal though. you might say a band is metal where i would say it was more rock so there really is easy way to class it. again i think the time it was produced plays a big factor because a lot of old "metal" would be considered hard rock by today's standards as metal has evolved into heavier and faster beats today. don't know if this helps at all.
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