Yes, Essentially you are looking for uniform heat distribution and to keep the flammable things such as grease away from the flame. So the metal shield (vaporizer bar) is essentially taking the uneven flame and turning it into a more uniform radiant head source and any grease that hits the steel smokes or flames off as it's introduced to the plate. Less flare ups with the metal shield vs the lava rocks as the grease is burned of as it's introduced vs the lava rocks where it can accumulate until it's combusted all at once.
Hope this helps.
The first thing you should do is make sure that your grill is very clean. This is due to the fact that if your grill is dirty then you will most likely make your food really smoky. With a gas grill you have lava rocks, these must be kept clean at all times or they can cause fires to flare up when you are grilling. Also make sure you do not stack your lava rocks, because this is potentially dangerous. Finally you must make sure to replace your lava rocks when they are looking broken or worn.
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No just use charcoal its inexpensive and works much better.
no, there are more rocks
Lava rocks are made of basalt, which is made from andesite and dacite. Basalt will come in a wide variety of textures as well as colors.
You don't need them for a propane grill. I put them in though because I like the flavor it adds to what I am cooking.
Lava is a liquid, not rocks.
The rocks inside are called intrusive igneous rocks, however when the volcano explodes it lets out lava which drys into metimorphic rocks.
I think the lava rocks are in the volcano on Mt. Puka.
when lava emerges on out of mountain then the molten lava cool to form rocks.
extrusive rocks can form from Basaltic Lava and Andesitic Lava. :)
Igneous rocks aren't affected by lava because they are made of cooled lava.