Magma is the liquid material, composed of rock, found within the actual volcano.Lava is basically magma outside of the volcano, on the surface of the earth.
The diagram to the right gives a pretty good indication of the various parts of a stratovolcano, though other volcanoes have similar figures. The main parts that we need to know are the Magma Chamber, Conduit/Fissure, Central Vent, and Crater.
The magma chamber is the magma reservoir in this diagram. It contains the majority of the active magma.
The fissure, or conduit, is the beginning of a tube like structure, central vent, in the center of the volcano. The conduit connects the magma chamber to the central vent. It is usually the primary point of release for magma.
Last but not least we have the crater which. in a more literal sense, could be the actual hole left after an explosion. However in the context of this diagram, it is merely the exit from which magma is released.
I think this is the picture Ms. Meyer used in our packet, so I hope that's alright that I use it. http://www2.edc.org/sciencequest/2001/SQ0110360/Inside.jpg
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