[[Person A approaches Person B with a rock in his hand.]]
A: Check it out - I got a piece of a meteor!
B: 
Actually
, it's only called that while falling. Once it lands, it's called 
magma
. 
My Hobby: mixing pedantic terms
{{Title text: No, only LAVA is called 'magma' while underground. Any other object underground is called 'lava'.}}